Prince William has a stark warning about the stigma surrounding mental health

Prince William has spoken out about his desire to "normalise" the "great taboo" of mental health in a powerful speech.

At the Guild of Health Writers conference at Chandos House, London, on Monday the Duke of Cambridge said it was vital that mental health should be viewed in the same way as physical health and that the subject should be normalised.

He said that until recently, people with anxiety were considered to be "weak," and those who were struggling to cope were deemed to be "failing."

"Successful, strong people don't suffer like that, do they. But of course – we all do. It's just that few of us speak about it," said the Duke of Cambridge.

See photos of Prince William through the years:

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Prince William through the years
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Prince William through the years
STIRLING, SCOTLAND - OCTOBER 24: Prince William, Duke of Cambridge during a visit to Stirling Castle on October 24, 2016 in Stirling, Scotland. The Duke of Cambridge in his role as Earl of Strathearn is Patron of The Thin Red Line Appeal to redevelop The Argyll and Sutherland Highlanders Regimental Museum at the Castle. (Photo by Mark Runnacles/Getty Images)
STIRLING, SCOTLAND - OCTOBER 24: Prince William, Duke of Cambridge meets local children during a visit to Stirling Castle on October 24, 2016 in Stirling, Scotland. The Duke of Cambridge in his role as Earl of Strathearn is Patron of The Thin Red Line Appeal to redevelop The Argyll and Sutherland Highlanders Regimental Museum at the Castle. (Photo by Mark Runnacles/Getty Images)
LONDON, ENGLAND - OCTOBER 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge meet athletes at a reception for Team GB's 2016 Olympic and Paralympic teams hosted by Queen Elizabeth II at Buckingham Palace October 18, 2016 in London, England. (Photo by Yui Mok - WPA Pool /Getty Images)
MANCHESTER, ENGLAND - OCTOBER 14: Prince William, Duke of Cambridge gets in a BAC 'Mono' Car as he visits the National Graphene Institute at the University of Manchester during their visit to Manchester on October 14, 2016 in Manchester, England. (Photo by Luca Teuchmann/WireImage)
LONDON, ENGLAND - OCTOBER 10: Prince William, Duke Of Cambridge attends the '100 Women In Hedge Funds' Gala Dinner In Aid Of Skillforce at Middle Temple Hall on October 10, 2016 in London, England. (Photo by Stuart C. Wilson - WPA Pool /Getty Images)
VICTORIA, BC - OCTOBER 01: (NO UK SALES FOR 28 DAYS) Prince William, Duke of Cambridge visits the Cridge Centre for the Family on October 1, 2016 in Victoria, Canada. (Photo by Pool/Samir Hussein/WireImage)
VICTORIA, BC - OCTOBER 01: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, Prince George and Princess Charlotte depart Victoria after the Royal Tour of Canada at Victoria Inner Harbour on October 1, 2016 in Victoria, Canada. (Photo by Karwai Tang/WireImage)
HAIDA GWAII, BC - SEPTEMBER 30: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive at the Haida Heritage Centre and Museum on September 30, 2016 in Haida Gwaii, British Columbia, Canada. (Photo by Karwai Tang/WireImage)
HAIDA GWAII, BC - SEPTEMBER 30: Catherine, Duchess of Cambridge and Prince William Duke of Cambridge arrive in a traditional canoe at Haida Heritage Centre on September 30, 2016 in Haida Gwaii, Canada. The Royal couple along with their Children Prince George of Cambridge and Princess Charlotte are visiting Canada as part of an eight day visit to the country taking in areas such as Bella Bella, Whitehorse and Kelowna (Photo by Chris Jackson/Getty Images)
ST. AUSTELL, UNITED KINGDOM - SEPTEMBER 02: Prince William, Duke of Cambridge visits the Eden Project in Cornwall on September 2, 2016 near St Austell, England. (Photo by Arthur Edwards - WPA Pool/Getty Images)
ST. AUSTELL, UNITED KINGDOM - SEPTEMBER 02: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the Eden Project in Cornwall on September 2, 2016 near St Austell, England. (Photo by Arthur Edwards - WPA Pool/Getty Images)
TRURO, UNITED KINGDOM - SEPTEMBER 01: Prince William, Duke of Cambridge visits Truro Cathedral on September 1, 2016 in Truro, United Kingdom. (Photo by Mark Cuthbert/UK Press via Getty Images)
ALBERT, FRANCE - JULY 01: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge with Prince Harry attend the Commemoration of the Centenary of The Battle of the Somme at The Commonwealth War Graves Commision Thiepval Memorial on July 01, 2016 in Albert, France. (Photo by UK Press Pool/UK Press via Getty Images)
ALBERT, FRANCE JUNE 30: Prince William, Duke of Cambridge speaks at the Somme Centenary commemorations at the Thiepval Memorial on June 30, 2016 in Albert, France. (Photo by Steve Parsons - Pool/Getty Images)
LONDON, ENGLAND - JUNE 11: Catherine, Duchess of Cambridge, Princess Charlotte, Prince George and Prince William, Duke of Cambridge and Queen Elizabeth II tand on the balcony during the Trooping the Colour, this year marking the Queen's official 90th birthday at The Mall on June 11, 2016 in London, England. The ceremony is Queen Elizabeth II's annual birthday parade and dates back to the time of Charles II in the 17th Century when the Colours of a regiment were used as a rallying point in battle. (Photo by Luca Teuchmann/Luca Teuchmann/WireImage)
LONDON, UNITED KINGDOM - JUNE 11: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge salutes as he attends Trooping the Colour, this year marking the Queen's 90th birthday on June 11, 2016 in London, England. The ceremony is Queen Elizabeth II's annual birthday parade and dates back to the time of Charles II in the 17th Century when the Colours of a regiment were used as a rallying point in battle. (Photo by Max Mumby/Indigo/Getty Images)
GUWAHATI, INDIA - APRIL 12: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge pose with dancers during a Bihu Festival Celebration at Diphlu River Lodge atKaziranga National Park on April 12, 2016 in Guwahati, India. (Photo by Samir Hussein/WireImage)
KAZIRANGA, ASSAM - APRIL 12: Catherine, Duchess of Cambridge looks on as Prince William, Duke of Cambridge tries to play an Indian whistle during a Bihu Festival Celebrationat Diphlu River Lodge on day 3 of the royal visit to India and Bhutan on April 12, 2016 in Kaziranga, India. The Duke and Duchess of Cambridge are on a week-long tour of India and Bhutan taking in Mumbai, Delhi, Assam, Bhutan and Agra. (Photo by Joe Giddens-Pool/Getty Images)
MUMBAI, INDIA - APRIL 10: Prince William, Duke of Cambridge, and Catherine, Duchess Of Cambridge, during Bollywood inspired charity gala dinner at Taj Palace Hotel on April 10, 2016 in Mumbai, India. (Photo by Pramod Thakur/Hindustan Times via Getty Images)
Britain Horse Racing - Royal Ascot - Ascot Racecourse - 15/6/16 Britain's Prince William Action Images via Reuters / Andrew Boyers Livepic EDITORIAL USE ONLY.
Britain's Prince William signs the book of condolences for the victims of the attacks in Paris, at the French Embassy, Knightsbridge, London, November 17, 2015. REUTERS/Jonathan Brady/Pool
Britain's Queen Elizabeth and Prince William, Duke of Cambridge, (R) chat with each other in the Royal Box at the Royal Albert Hall during the Annual Festival of Remembrance in London November 7, 2015. REUTERS/Chris Jackson/Pool
Britain's Prince William, Duke of Cambridge, poses after painting the eye of a "Shaun the Sheep" sculpture at the British Ambassador's official residence in Beijing March 2, 2015. REUTERS/Fred Dufour/Pool (CHINA - Tags: POLITICS ROYALS ENTERTAINMENT PROFILE HEADSHOT)
Britain's Prince William, Duke of Cambridge, waves to fans from a car window upon his arrival at the Tsutaya bookstore Daikanyama in Tokyo February 28, 2015. Prince William visited the bookstore to launch a week-long public exhibition titled "Innovation is Great". Prince William is in Japan for a four-day visit. REUTERS/Issei Kato (JAPAN - Tags: ROYALS ENTERTAINMENT)
Britain's Catherine, Duchess of Cambridge, carries her son Prince George as he examines a butterfly on the hand of his father Prince William during a visit to the Sensational Butterflies exhibition at the Natural History Museum in London, July 2, 2014. Prince George celebrates his first birthday on July 22. Picture taken July 2, 2014. REUTERS/John Stillwell/Pool (BRITAIN - Tags: ROYALS SOCIETY) ATTENTION EDITORS - FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS
Britain's Prince William prepares to dive at a swimming pool, with British Sub-Aqua Club (BSAC) members, in central London July 9, 2014. The Prince and his father Prince Charles attended a reception to mark the handover of the Presidency of BSAC from Prince Charles to Prince William. REUTERS/Justin Tallis/Pool (BRITAIN - Tags: ENTERTAINMENT SOCIETY ROYALS)
Britain's Catherine, the Duchess of Cambridge, waves with her husband Prince William, as she holds her son Prince George before they depart Canberra April 25, 2014. The Prince and his wife Kate are undertaking a 19-day official visit to New Zealand and Australia with their son Prince George. REUTERS/Phil Noble (AUSTRALIA - Tags: POLITICS ENTERTAINMENT ROYALS)
Britain's Prince William waves with his wife Catherine, the Duchess of Cambridge, as they walk down the steps of the Sydney Opera House April 16, 2014. Britain's Prince William, his wife Kate and their son Prince George flew from New Zealand to Australia, where they will now spend nine-days touring the country. REUTERS/David Gray (AUSTRALIA - Tags: ROYALS ENTERTAINMENT)
Catherine (R), Duchess of Cambridge, and her husband, Britain's Prince William, laugh as they watch a young players' rugby tournament held at Forsyth Barr Stadium in Dunedin April 13, 2014. Prince William and his wife are undertaking a 19-day official visit to New Zealand and Australia with their son, Prince George. REUTERS/David Rowland/Pool (NEW ZEALAND - Tags: SOCIETY ROYALS SPORT RUGBY TPX IMAGES OF THE DAY)
Britain's Prince William smiles during a visit to the head office of the St Giles Trust, in Camberwell, south east London November 6, 2013. The St Giles Trust works with former criminals to help them break the cycle of crime. REUTERS/David Crump/Pool (BRITAIN - Tags: SOCIETY ROYALS)
Britain's Prince William and his wife Catherine, Duchess of Cambridge appear with their baby son, outside the Lindo Wing of St Mary's Hospital, in central London July 23, 2013. Prince William and his wife Kate gave the world its first glimpse of their new baby on Tuesday when they left hospital to a barrage of camera flashes with the boy who is third in line to the British throne. Picture taken July 23, 2013. REUTERS/Cathal McNaughton (BRITAIN - Tags: ROYALS ENTERTAINMENT HEALTH)
Britain's Prince William walks through the set used to depict Hogwart's 'Great Hall' in the Harry Potter films during the inauguration of Warner Bros. Studios Leavesden in London April 26, 2013. REUTERS/Chris Jackson/POOL (BRITAIN - Tags: ROYALS ENTERTAINMENT)
Britain's Prince William and his wife Catherine, Duchess of Cambridge speak with recently bereaved children William, Beatrice and Georgina Howitt (L-R) during their visit to the offices of Child Bereavement UK in Saunderton, southern England March 19, 2013. REUTERS/Paul Edwards/pool (BRITAIN - Tags: ROYALS ENTERTAINMENT SOCIETY)
Britain's Prince William leaves the King Edward VII hospital with his wife Catherine, Duchess of Cambridge, London December 6, 2012. Prince William's pregnant wife Kate left the King Edward VII hospital in central London on Thursday where she had spent four days being treated for acute morning sickness. REUTERS/Andrew Winning (BRITAIN - Tags: ENTERTAINMENT ROYALS)
Britain's Prince William speaks at the Mission Serve: Hiring Our Heroes event in Culver City, California July 10, 2011. Prince William and his wife Catherine are on a royal visit to California from July 8 to July 10. REUTERS/Danny Moloshok (UNITED STATES - Tags: POLITICS ROYALS ENTERTAINMENT)
Britain's Prince William paints a picture during a tour of the Inner City Arts campus in Los Angeles, California July 10, 2011. Prince William and his wife Catherine, Duchess of Cambridge are on a royal visit to California from July 8 to July 10. REUTERS/Alex Gallardo (UNITED STATES - Tags: POLITICS ROYALS SOCIETY ENTERTAINMENT)
Britain's Prince William plays in a charity polo match at the Santa Barbara Polo and Racquet Club in support of the American Friends of The Foundation of Prince William and Prince Harry in Santa Barbara, California, July 9, 2011. REUTERS/Gus Ruelas (UNITED STATES - Tags: ENTERTAINMENT POLITICS ROYALS SPORT)
Britain's Prince William tips his hat to Calgary during his speech at the Calgary Stampede in Calgary, Alberta, July 7, 2011. The Prince and his wife are on a royal tour of Canada from June 30 to July 8. REUTERS/Todd Korol (CANADA - Tags: ROYALS ENTERTAINMENT SOCIETY HEADSHOT)
Britain's Prince William and his wife Catherine, Duchess of Cambridge, chat with flower presenters Ameile Wood and Marco Paolo Esteban (R) upon their arrival in Yellowknife, Northwest Territories July 4, 2011. Prince William and his wife Catherine are on a royal tour of Canada from June 30 to July 8. REUTERS/Andy Clark (CANADA - Tags: ROYALS SOCIETY ENTERTAINMENT POLITICS)
Britain's Prince William and his wife Catherine, Duchess of Cambridge, look at oysters in Dalvay-by-the Sea, Prince Edward Island July 4, 2011. REUTERS/Mark Large/Pool (CANADA - Tags: ENTERTAINMENT POLITICS SOCIETY ROYALS)
Britain's Prince William greets spectators during an official welcoming ceremony at Rideau Hall in Ottawa June 30, 2011. Prince William and his wife Catherine, Duchess of Cambridge, are on a royal tour of Canada from June 30 to July 8. REUTERS/Chris Wattie (CANADA - Tags: ENTERTAINMENT POLITICS ROYALS SOCIETY)
Britain's Prince William inspects the honour guard during an official welcoming ceremony at Rideau Hall in Ottawa June 30, 2011. Prince William and his wife Catherine, Duchess of Cambridge, are on a royal tour of Canada from June 30 to July 8. REUTERS/Chris Wattie (CANADA - Tags: ENTERTAINMENT POLITICS ROYALS)
Britain's Catherine, Duchess of Cambridge (L) sits in the Royal Box on Centre Court with her husband Prince William, for the match between Andy Murray of Britain and Richard Gasquet of France at the Wimbledon tennis championships in London June 27, 2011. REUTERS/Suzanne Plunkett (BRITAIN - Tags: ENTERTAINMENT SOCIETY ROYALS SPORT TENNIS)
Britain's Prince William and his wife Catherine, Duchess of Cambridge kiss on the balcony at Buckingham Palace, watched by bridemaids Grace van Cutsem (L) and Margarita Armstrong-Jones and pageboy Tom Pettifer, after their wedding in Westminster Abbey, in central London April 29, 2011. Prince William married his fiancee, Kate Middleton, in Westminster Abbey on Friday (ROYAL WEDDING/ BALCONY) REUTERS/Dylan Martinez (BRITAIN - Tags: ROYALS ENTERTAINMENT SOCIETY) BEST QUALITY AVAILABLE
Britain's Prince William and his wife Catherine, Duchess of Cambridge kiss on the balcony of Buckingham Palace, following following their wedding at Westminster Abbey in London April 29, 2011. (ROYAL WEDDING/BALCONY) REUTERS/John Stillwell/Pool (BRITAIN - Tags: ENTERTAINMENT SOCIETY ROYALS)
Britain's Prince William smiles after showing his grandmother, Queen Elizabeth, around a Sea King search and rescue helicopter, during a visit to RAF Valley, in north Wales, April 1, 2011. Prince William, who is due to marry Kate Middleton on April 29, is serving as a search and rescue helicopter pilot, based at RAF Valley on Anglesey, an island off the north west coast of Wales. REUTERS/Phil Noble (BRITAIN - Tags: ENTERTAINMENT ROYALS)
Britain's Prince William sits at the controls of a Sea King helicopter during a training exercise at Holyhead Mountain, in Wales March 31, 2011. Prince William is serving as a search and rescue helicopter pilot, based at RAF Valley on Anglesey, an island off the north west coast of Wales. Photograph taken on March 31, 2011. REUTERS/John Stillwell/Pool (BRITAIN - Tags: ENTERTAINMENT SOCIETY ROYALS)
Britain's Prince William attends a national memorial service for victims of last month's earthquake, in Christchurch March 18, 2011. REUTERS/Mick Tsikas (NEW ZEALAND - Tags: ROYALS POLITICS DISASTER HEADSHOT)
Britain's Prince William wears an iconic Australian Akubra hat as he greets the crowd during his visit to Toowomba, Queensland, March 20, 2011. Prince William is on a tour of New Zealand and Australia in a show of solidarity with the two countries that have been plagued by natural disasters in the last year. REUTERS/Daniel Munoz (AUSTRALIA - Tags: POLITICS ROYALS)
Britain's Prince William greets people after his arrival in Cardwell, Queensland March 19, 2011. Prince William is on a tour of New Zealand and Australia in a show of solidarity with the two countries that have been plagued by natural disasters in the last year. REUTERS/Daniel Munoz (AUSTRALIA - Tags: POLITICS ROYALS)
Britain's Prince William gestures while speaking with members of the Urban Search and Rescue team in Christchurch March 17, 2011. Prince William is visiting New Zealand until March 19. REUTERS/Hannah Johnston/Pool (NEW ZEALAND - Tags: ROYALS POLITICS)
Britain's Prince William leaves a charity event at city company ICAP, in central London December 8, 2010. REUTERS/Suzanne Plunkett (BRITAIN - Tags: ENTERTAINMENT BUSINESS SOCIETY ROYALS)
Britain's Prince William (L) and his girlfriend Kate Middleton are seen attending the Six Nations international rugby union match against Italy in London in this February 10, 2007 file photograph. Britain's Prince William is to marry his long-term girlfriend Kate Middleton next year, Buckingham Palace said on November 16, 2010. REUTERS/Eddie Keogh/Files (BRITAIN - Tags: ENTERTAINMENT SOCIETY ROYALS SPORT RUGBY)
Britain's Princes Harry and William visit the Red Cross Childrens' Hospital in Cape Town, June 18, 2010. REUTERS/Mike Hutchings (SOUTH AFRICA - Tags: POLITICS ROYALS ENTERTAINMENT)
Britain's Prince William visits a school run by the charity Sentebale, founded by Prince Harry and Lesotho's Prince Seesio, in the village of Semongkong, Lesotho June 17, 2010. Princes Harry and William are on a two day tour to Lesotho. REUTERS/Arthur Edwards/POOL (LESOTHO - Tags: ROYALS POLITICS SOCIETY)
Britain's Duke of York and Prince William (R) take part in the procession of the Order of the Garter in Windsor, London June 14, 2010. The order was founded by King Edward III in 1348 and includes the Prince of Wales and 24 knights. REUTERS/Sergeant Dan Harmer/MoD/Crown Copyright/handout (BRITAIN - Tags: ROYALS) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS
Britain's Prince William wears a pair of special pair of glasses which simulate the affects of maculor degeneration during his visit to St Dunstan's, a specialist centre for blind ex-service men and women, in Llandudno, North Wales February 22, 2010. REUTERS/Peter Byrne/pool (ROYALS ENTERTAINMENT SOCIETY MILITARY)
Britain's Prince William arrives at Sydney's Kingsford Smith airport to begin the Australian leg of his tour January 19, 2010. REUTERS/Mike Bowers (AUSTRALIA - Tags: SOCIETY ROYALS)
Prince William of Britain speaks during the opening of the new Supreme Court building in Wellington on the second day of a three day visit to New Zealand January 18, 2010. REUTERS/POOL/Mike Heydon (NEW ZEALAND - Tags: ROYALS)
Britain's Prince William (R) applauds after his brother Prince Harry delivered a speech in west London January 8, 2009. The Princes attended a reception as joint patrons to mark the formal launch of a charity, the Henry Van Strawbenzee Memorial Fund. The charity was set up following the death of Henry Van Strawbenzee - a friend of the Princes - and aims to support schools in Uganda, where Henry was working. REUTERS/Toby Melville (BRITAIN)
Britain's Prince William sits with his father Prince Charles (R) and Chelsy Davy (L) as his brother Prince Harry is awarded the Operational Service Medal for Afghanistan by his aunt, Princess Anne, during a service at the Combermere Barracks in Windsor May 5, 2008. Harry and other members of the Household Cavalry Regiment were awarded military service medals on Monday for 10 weeks of frontline service in Afghanistan. REUTERS/John Stillwell/Pool (BRITAIN)
Britain's Prince William talks with members of the "Cycle of Life" team at Clarence House in London March 31, 2008, before they set off for their 5000 mile ride across rural Africa in aid of charity "Tusk Trust". REUTERS/Stephen Hird (BRITAIN)
Britain's Prince William attends the annual Remembrance Sunday ceremony on Armistice Day at the Cenotaph in Whitehall in central London, November 11, 2007. REUTERS/Toby Melville (BRITAIN)
Britain's Princes William (L) and Harry speak on stage at Wembley Stadium in London at the "Concert for Diana", held in memory of their mother Princess Diana, July 1, 2007. On what would have been Diana's 46th birthday, Princes William and Harry have lined up a string of pop veterans from Rod Stewart to Duran Duran for a six-hour show being broadcast to 145 countries. REUTERS/Stephen Hird (BRITAIN)
Britain's Prince William arrives for a Service of Thanksgiving for the 80th Birthday of Britain's Queen Elizabeth II at St. Paul's Cathedral in London June 15, 2006. The Queen's official 80th birthday is on June 17, 2006. REUTERS/John D McHugh/AFP Photo/WPA Pool (BRITAIN)
England's Prince William applauds during the Group B World Cup 2006 soccer match between England and Paraguay in Frankfurt June 10, 2006. FIFA RESTRICTION - NO MOBILE USE (GERMANY) REUTERS/Eddie Keogh
Britain's Prince William talks to journalists after a training session with players from Charlton Athletic Football Club at their training ground in London October 28, 2005. William will become president of the English Football Association in May next year.
Prince William signs a book of condolence in memory of those who where killed and injured in the terrorist attacks on London, at the British Consulate in Auckland July 9, 2005. Prince William signed the book in-between performing official duties and watching the British and Irish Lions tests during his ten-day tour of New Zealand, his first official tour of a foreign country by himself.
Prince William waves on arrival at the Guildhall in Windsor, southern England, for the civil wedding ceremony of his father [Prince Charles to Camilla Parker Bowles] April 9, 2005. [Prince Charles and his long-term partner, who became Her Royal Highness the Duchess of Cornwall on the marriage, married on Saturday in a low-key ceremony.]
Prince William, son of Britain's Prince Charles, waves on his arrival at the Guildhall in Windsor, southern England for his father's civil wedding ceremony to Camilla Parker Bowles, April 9, 2005. Prince Charles and his long-term partner Camilla, who becomes the Duchess of Cornwall on the marriage, married on Saturday in a low-key ceremony. REUTERS/Russell Boyce CRB/ASA
Britain's Prince William makes his water polo debut for the Scottish national universities squad in the annual Celtic Nations tournament against Wales and Ireland in Cardiff, 17 April, 2004. REUTERS/POOL DBP
Britain's Prince William smiles during a visit to the opening of Pilot Project in Newport, south Wales, June 19, 2003. The project is an art based project to provide homeless people with confidence that could enable them to move onto further education, training and employment. Prince William is taking part in an official visit to Wales, with his father Prince Charles, to mark his impending 21st birthday on June 21. The trip will be the only official engagement to mark his coming of age. REUTERS/Russell Boyce RUS/MD
Britain's Princes William (R) and Harry arrive for the annual Trooping the Colour Parade held to mark the birthday of Britain's Queen Elizabeth II in central London June 14, 2003. The Queen's actual birthday falls on April 21 and saw her turn 77 this year, however it is customary for the official birthday celebrations to be held on a Saturday in June. REUTERS/Keith Waldegrave NMB
Prince William sits in front of lobster pots on the harbourside at St Andrews, Scotland, May 28, 2003. The Prince, who celebrates his 21st birthday in June, is two years into a four year History of Art degree at the Scottish university city.
Prince William is pictured inside St Andrews University, Scotland, May 28, 2003. The Prince, who celebrates his 21st birthday in June, is two years into a four year History of Art degree.
Viscount Linley (L) and Prince William follow the gun carriage carrying the coffin of the Queen Mother during a ceremonial procession in central London, April 5, 2002. Thousands of mourners lined the route to pay their last respects to the Queen Mother who died aged 101. The funeral will take place on April 9 after which she will be interred at St George's Chapel in Windsor next to her late husband King George VI. REUTERS/Michael Crabtree PS
Britain's Prince William, [eldest son of The Prince of Wales] sits in front of the extinct volcano, Arthur's Seat, in the grounds of Holyrood House Palace, Edinburgh, Scotland, September 21, 2001. He starts his university course at Saint Andrews studying art history next week.
Princes William and Harry (L) leave St. Paul's Cathedral in central London July 11. The Royal Family were joined by monarchs from around Europe and British centenarians to start a month of celebrations to mark the 100th birthday of the [Queen Mother. ]
Prince William sits in front of a computer at his school, Eton College in this photo, one of a series officially released by St James Palace, June 16 to mark the Prince's eighteenth birthday next week. The Prince is currently studying for his A Level exams before going on to university. HP/ws
Britain's Prince Charles (C) looks on as his sons Prince William (L) and Harry (R) accept gifts of Roots clothing as worn by the Canadian Olympic Team, March 24. The Princes were on hand at a reception at the Vancouver Trade and Convention Centre for the unveiling of a plan to set aside more parklane in British Columbia. CANADA ROYALS
Diana, the Princess of Wales, is shown entering a production of Beauty and the Beast in MGM Studios at Walt Disney World with her son Prince William August 25
FILE PHOTO APRIL 92 - After the announcement yesterday of the separation between [Princess Diana and the Prince of Wales], there is a speculation that their eldest son Prince William (seen here at an Eastern Sunday Service) will take the throne after Prince-Charles steps aside.
Britain's Prince William (L) and Prince Harry wave from the deck of the Royal Yacht Britannia after arriving aboard on the Toronto waterfront on October 22, 1991. REUTERS/Andy Clark
Princess Diana holds Prince Harry as her older son Prince William (L) looks out over the balcony of Buckingham Palace in London on June 11, 1988 after attending the Trooping the Colour ceremony, the Queen's birthday parade. REUTERS/Stringer
Prince William (L) peeks around at his brother Prince Harry (R) on board a boat on Necker Island in the British Virgin Islands where they were on holiday April 8, 1990. REUTERS/Rob Taggart
Princess Diana holds her two sons Prince William, 6, and Prince Harry, 3, (front) as they pose during the mornings's picture session on August 9, 1987 in Palma de Mallorca, Spain. REUTERS/Hugh Peralta
Prince William is seen making a royal salute as he watches the scene of Trooping the Colour from the balcony of Buckingham Palace with his brother Harry and mother Princess Diana in London in this June 15, 1985 file photograph. Britain's Prince William is to marry his long-term girlfriend Kate Middleton next year, Buckingham Palace said on November 16, 2010. REUTERS/Roy Letkey/Files (BRITAIN - Tags: SOCIETY ROYALS)
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He said that his interest in mental health began with his work as an Air Ambulance pilot.

"It was suicide, a subject that is so often hidden. The suicide rate among young men in this country is an appalling stain on our society," said the prince.

"Suicide is the biggest killer of men under 40 in this country. Not cancer, not knife crime, not road deaths – suicide," he continued.

The prince said if any one of the aforementioned issues caused so many deaths, there would be a "national outcry."

"But there has only ever been silence. And this has to stop. This silence is killing good people," the prince said.

The prince said that in his work as in Search and Rescue and as an Air Ambulance pilot, he has been encouraged — along with his colleagues — to admit when they feel "overwhelmed or unable to cope".

"This should be the norm," he said.

RELATED: See photos of Kate Middleton through the years:
194 PHOTOS
Kate Middleton's style transformation
See Gallery
Kate Middleton's style transformation
For the Wimbledon finals, Kate recycled this Jonathan Saunders dress she wore during the Jubilee Royal Tour in 2012.
Kate, William and Harry kicked off the Tour de France in July. Kate was wearing her green Erdem coat and favorite L.K. Bennett sledge pumps.
The Duchess of Cambridge visits an M-PACT Plus Counselling programme at Blessed Sacrament School on July 1st in a coral GOAT dress with cream clutch.    
Kate is seen wearing Alexander McQueen to a military event in London.
Duchess Kate attends Order of the Garter in a lovely pale blue Christopher Kane coat.
Prince George of Cambridge walks holding his Catherine, Duchess of Cambridge's hand as they watch Prince William, Duke of Cambridge & Prince Harry play in the Jerudong Trophy charity polo match. Kate is seen wearing a casual striped top and a pair of skinny jeans, while George is wearing an adorable pair of overalls.
The Duchess of Cambridge during an official visit to National Maritime Museum on June 10, 2014 in London, England.
Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a service during the D-Day 70 Commemorations on June 6, 2014.
Catherine, Duchess of Cambridge holds Prince George of Cambridge as they leave Fairbairne Airbase to head back to the UK after finishing their Royal Visit to Australia.
Catherine, Duchess of Cambridge attends a reception hosted by the Governor General Peter Cosgrove at Government House on April 24, 2014 in Canberra, Australia.
Kate attended the SportsBall, donning a laser-cut, black lace Temperley London cocktail dress, paired with her Jimmy Choo heels and Alexander McQueen clutch.
Kate looked lovely in London, wearing an Orla Kiely skirt and MaxMara coat as she received flowers from a young girl.
Kate recycled an Orla Kiely dress and her Aquatalia boots for a charity visit with William.
Kate wore a pretty black Temperley coat to honor Remembrance Day in London, wearing her hair in ringlets.
In honor of Poppy Day, William and Kate stepped out in London -- Kate wearing her long scarlet L.K. Bennett coat.
Kate attended a charity gala the following day, wearing an elegant navy Jenny Packham gown.
Kate chose Alexander McQueen for Prince George's Christening.
Kate attended the SportsAid Athlete Workshop just a few months after having Prince George. She wore a pre-pregnancy outfit: her J.Brand skinny jeans, Ralph Lauren striped top, navy Smythe blazer and Stuart Weitzman wedges.
Kate and William attended a gala for the Tusk Trust, Kate glittering in Jenny Packham.
Kate joined William out and about in Anglesey, wearing a Zara top, Paige denim jeans and a Ralph Lauren jacket.
Kate wore another Seraphine knot-front dress for the photo while William was casual in a gingham button down.  And in this photo, both the Middletons' family dog and Lupo made the cut!
Kate and William pose with Prince George for the family's first official portraits at her family's home.
Kate definitely had a new mom glow about her when she left the Lindo Wing of St. Mary's Hospital.
When Wills and Kate took off to go visit her parents in Bucklebury for the first few weeks after George's birth, she wore a dress by Seraphine perfect for new moms.
Kate wore a bespoke Jenny Packham blue polka dotted dress when she presented her son to the world, and she looked lovely.
For her last official appearance before giving birth, the Duchess chose pale pink Alexander McQueen at the 2013 Trooping the Colour.
Kate was glowing as she named a cruise ship in a printed Hobbs coat.
Kate looked positively lovely at the Queen's Coronation service in one of her favorite designers, Jenny Packham, a light peach, almost nude lace empire-waisted dress.
Kate was bold and bright at this year's Garden Party, wearing a bespoke version of the Marella coat by Emilia Wickstead.
Kate visited Naomi House on the day of her wedding anniversary, wearing a peach coat by Tara Jarmon.
Kate visited the Harry Potter sets at Warner Bros with William and Harry, wearing in a polka-dot dress by Topshop.
Kate attended an event at the National Portrait Gallery, wearing a '50s-inspired, powder blue Emilia Wickstead dress and grey suede pumps. 
Kate visited a primary school in a pretty Erdem floral dress.
Kate attended the National Review of the Queen's Scouts, wearing a mint green Mulberry Coat, Whiteley fascinator and her L.K. Bennett pumps.  As you can see, the Duchess finally popped and her baby bump was fully visible.
Kate donned her red Armani coat, as seen on her in 2006, for the visit to Scotland.
During a visit to Scotland,  Kate and Wills met well wishers, played some ping pong, field hockey and basketball while she wore this tartan coat by British brand moloh.
Kate visited the Great Tower Scout camp, keeping warm in green rain boots, a green army jacket and a knit crochet hat.
Kate visits the Baker Street Underground Station in this teal Malene Birger coat, and true to royal style: a pretty black fascinator.
Dressed in a pretty white Redgrave Goat collarless coat over a dress from Topshop, Kate visited the headquarters of Child Bereavement UK.
Kate Middleton wore this black Topshop dress as she visited the headquarters of Child Bereavement UK.
The Duchess of Cambridge attended the St Patrick's Day Parade at Mons Barracks in the same gorgeous green Emilia Wickstead coat of the previous year.
Kate attended the fourth and final day of the Cheltenham Festival in a gorgeous peach wool coat by Joseph.
Kate visited Grimsby in a gorgeous brown Hobbs coat, with her baby bump just starting to show.
Kate showed off her baby bump in a patterned MaxMara dress and simple pumps during a visit to Hope House. 
Kate looks on in a pretty Whistles dress after viewing her first official portrait.
Kate left the hospital, after being admitted for severe morning sickness, in a navy coat by Diane von Furstenberg.
Kate played hockey  in Alexander McQueen while visiting St. Andrews University.
Kate wore this MaxMara Studio coat over a leopard-print dress for her and William's first visit to Cambridge.
Kate was glowing in an emerald green Mulberry dress for an opening at the Natural History Museum.
Kate dons her lace Temperley London gown once more, this time adding a pop of red with her Alexander McQueen clutch.
Kate attended a royal reception for team Great Britain's Olympic and Paralympic athletes, wearing a black floral dress with sheer sleeves.
Kate bends down to receive flowers from an adorable two-year-old, looking lovely in Alexander McQueen.
Back in the UK, Kate and Wills attend the official launch of the new Football Centre, the Duchess wearing a Reiss coat.
Kate wore this navy eyelet Mulberry dress with traditional adornments during their visit, with her hair in natural waves.
Kate prepared to dance with traditional dancers, in a much cooler grass skirt than we've ever seen. 
The royal couple boarded a plane, Kate wearing a pale yellow eyelet dress and Stuart Weitzman wedges.
The Duke and Duchess smiled in traditional Island clothing as they visited the Governor General's house.
This yellow Jaeger shirtdress was light, bright and cool for the warm island weather.
On day 6, Kate and Wills arrived at the Solomon Islands, Kate dressed in a bright Jonathan Saunders dress.
The casual duo cross a bridge at a Rainforest Research center in Malaysia.
Kate wore this sparkling Alexander McQueen to a dinner with Malaysia's Head of State.
Kate wore a pale teal dress to visit the Memorial Cemetery in Singapore, looking back thoughtfully as she walked beside her husband.
While in Malaysia, Kate wore an ice blue lace Temperley London dress, with her hair pulled back in a pretty updo.
On Day 4, Kate and William visited a Mosque, respectfully removing their shoes, Kate wore a headscarf and looked lovely in white.
Kate looked gorgeous in a floral Erdem dress during the British Gala reception.
She also wore a lovely Alexander McQueen skirt and jacket with Stuart Weitzman wedges.
On day 2, Kate wore this sheer Raoul dress and nude pumps.

Kate and William kicked off the 2012 Diamond Jubilee tour in Singapore, the Duchess wearing a vibrant dress by Prabal Gurung.

Kate looked chic and professional at the Paralympics Day 4 medal ceremony.
Kate attends the 10th day of the Olympics in a zipped-up windbreaker for the sailing events.
Wills and Kate celebrate a big win for the UK during the Olympics.
The Olympics took London by storm, and the young royals weren't going to miss it.  Kate sported UK colors in this striped top and navy jeans.
Kate and William visited Bacon's College with Prince Harry, Kate dressed in a grey and white checked dress.
Our three favorite royals wait to receive the Olympic Torch at Buckingham Palace on it's route around Britain to the Olympic Stadium.  
Kate looked vibrant in Stella McCartney while visiting the National Portrait Gallery.
Kate looked chic in white at Wimbledon, carrying a fun animal print clutch.
Kate payed homage to Scotland with her clutch while she watched as Prince William was installed as a Knight of the Thistle in Edinburgh.
Time for the Order of the Garter, and while most members of the royal family were in pale hues, Kate's Alexander McQueen stole the show.
Kate wore wellies to a polo match, with casual jeans and her pooch Lupo by her side.
Kate waved from a carriage during the Trooping the Colour ceremony, wearing one of her favorite designers, Erdem.
The Diamond Jubliee continues, and Kate is seen in a nude lace Alexander McQueen dress with a Jane Taylor fascinator.
Kate wore a vibrant red Alexander McQueen dress, carrying a clutch by the same designer and sporting her favorite L.K. Bennett heels during the Diamond Jubilee celebrations.
Kate is pretty in pink at the Queen's Garden Party at Buckingham Palace, wearing an Emilia Wickstead dress and classic nude heels.
Ok, so maybe this photo is more about the puppy-love than the dress, but the Duchess still looks chic, even while playing with her and Wills' pup, Lupo!
Attending an Olympic Concert, Kate dominated the red carpet in a lace-back Jenny Packham gown.
Kate shows a little leg in this sleek Roland Mouret gown.
In one of our favorite looks, Kate had the embellishment on the neckline of this Matthew Williamson dress added just for her -- and she looked gorgeous.
The Duchess is a hard worker! Helping to plant a tree, Kate still looked totally glam in a vibrant blue Reiss dress.
It was St. Patrick's Day, and Kate looked gorgeous in green, a belted Emilia Wickstead dress.
Kate looked cute and casual in coral skinny jeans while playing hockey with the Olympic team.
Kate wore an Orla Kiely dress for a visit in South London.
Kate wore this peplum skirt suit by L.K. Bennett and a James Lock hat during a visit to Leicester, England.
Kate wore this slightly distressed tweed Missoni coat to tea with the Queen and Camilla. 
Kate visited schools in Oxford, wearing a flared, bird-print Orla Kiely dress.
Kate wore this brown Hobbs coat to visit Liverpool, pairing it with black stockings and pumps.
Kate visited the National Portrait Gallery in a belted grey jacket with a wide collar.
Attending the premiere of War Horse in the UK, Kate wore a lace Temperley London gown.
The royal family attended a Christmas Day service, all in chic jackets and boots as they arrived together.
Just before the holidays, the Duke and Duchess visited a homeless charity, Kate in a simple Ralph Lauren turtleneck dress.
Prince William, Kate and Prince Harry arrive at the Imperial War Museum, all dressed in their black-tie best.
Kate spoke with dinner guests at a reception at St. James Palace, wearing a silver one-shouldered gown.
A beautiful duo: Kate wore this crimson Beulah London gown, adding some vibrance to Fall in London.
Kate looked lovely in Amanda Wakeley as she and William visited the Royal Marsden Hospital.
The Duke and Duchess visited Birmingham, Kate wearing Alexander McQueen.
Kate sparkled in this classic drape dress by Roksanda Ilincic.
Kate and Wills are back in the U.K., the Duchess wearing a beige v-neck dress for the opening of the state rooms in Buckingham Palace.
Kate in Santa Barbara, in a floral Jenny Packham dress.
Kate and Wills attended the BAFTA Awards, Kate showing off a tiny waist in this Sarah Burton for Alexander McQueen floor length gown.
Kate wore this grey shift by London-based designer Roksanda Ilincic while in Los Angeles.
The Duke and Duchess arrived in Los Angeles, Kate in a bright green dress by one of our favorite designers, Diane von Furstenberg.
Kate looked lovely in this canary yellow Jenny Packham dress, but battled with the wind at Calgary International Airport.
The Duke and Duchess boarded a Canadian Airforce jet, Kate wearing J. Brand skinny jeans and L.K. Bennett slingback wedges.
Kate looked cool and casual in boat shoes and jeans.
Kate and Wills smile at one another, the Duchess dressed in Sarah Burton for Alexander McQueen on their 5th day in Canada.
The newyweds are cute and casual, in a rare embrace (public, at least!) after taking part in a dragon boat race.
Kate wore this simple white shift during their Canada visit, carrying her favorite L.K. Bennett "Natalie" clutch.
On day 4 of their Canada visit, Kate was seen in a brilliant blue Erdem dress with lace detailing on the bodice.
Kate wore this grey shift dress while in Canada, with a pointed collar and cuffed sleeves.
Kate was a bronzed beauty in this long-sleeved, purple Issa dress on the royal couple's Canada tour.
Kate looks over her shoulder as she and Wills attend Canada Day celebrations in Ottowa. She was wearing a white Reiss dress with bold red accents in her fascinator and heels.
Kate wore a lace Erdem shift dress and nude L.K. Bennett heels while attending the wreath-laying ceremony at the National War Memorial in Canada.
Kate wore this bold Alexander McQueen military-style coat while visiting army Barracks in Windsor.
Kate and Camilla, Duchess of Cornwall, wearing pretty coats to the Order of the Garter Service.
Kate wore her Jane Troughton cornflower blue brocade coat to the church service celebrating the 90th birthday of Prince Philip.
Kate and William were the picture of elegance at the 2011 Trooping the Colour ceremony for the Queen's birthday.
Kate and her sister Pippa attend a friend's wedding, both dressed in black and white patterned dresses and matching court shoes.  
Kate attended the 10th Annual ARK Gala Dinner in a stunning floor-length embellished Jenny Packham gown.
Kate attended Derby Day, everyone dressed to the nines.  The Duchess was in a white Reiss dress and beige fascinator.
The Duchess met Michelle Obama in Buckingham Palace, wearing a cap-sleeved neutral Reiss dress.
Kate and William headed out for their honeymoon the day after their wedding, Kate dressed in a simple belted blue dress and her L.K. Bennett wedges.
Kate leaving Clarence House to attend the evening celebrations following her wedding to Prince William, in a pretty satin dress with an embellished belt showing off her tiny waist.
The new Duke and Duchess of Cambridge kiss on the balcony of Buckingham Palace to cheers from the crowd.
The blushing bride steps out of Westminster Abbey, stunning in her Sarah Burton for Alexander McQueen gown.
Here comes the almost-bride... Kate smiled for the camera as she arrived at the Goring Hotel with her mom and sister the day before her wedding.  She looked stunning in a patterned Issa dress and L.K. Bennett wedges.
Kate wore a flared neutral trench coat while visiting Northern Ireland.
The dashing couple matched in navy blue suits while visiting an athletic track in Darwen, England.
Kate and William visit their Alma Mater, St. Andrews University, for its 600th anniversary celebrations.
Kate wore all shades of neutral to launch a new RNLI lifeboat in the chilly February weather.
The couple attended a Christmas "Spectacular," Kate dressed in contrasting black and white with a bold necklace.
The couple looked lovely and happy as can be!
For Kate and William's official engagement photos, she chose a white Reiss dress.
A royal engagement! Kate's navy Issa dress from her engagement photo is one of the most sought-after dresses she's worn.
Kate and Wills attend a friend's wedding, Kate wearing a bright silk dress with a black jacket and accessories.
Kate chose a belted teal sundress and leather bag for the Chakravarty Cup Polo Match.
Kate wore a stunning blue patterned Jane Troughton coat to a friend's wedding, paired with a Jane Corbett fascinator and black court shoes.
Kate wore skinny jeans and a leather jacket to a charity Polo match in which Prince William and Harry were playing.
Kate attended the Day-Glo Midnight Roller Disco in London, supporting an Oxford charity.
Kate channeled the '60s in this mod-inspired dress while out in London.
Kate looked lovely at Lady Rose Windsor's wedding, wearing a pop of color and print with black accessories.
Kate wore a pretty white Issa sundress with a cardigan to the Wimbledon tennis championships.
Always there to support, Kate watched Wills and Harry play in a charity polo match.
Kate attended the Most Noble Order of the Garter service, standing with Camilla, Duchess of Cornwall in contrasting black and white.
Kate in her go-to casual look: jeans and a jacket.
Kate with Prince William after his graduation, now a Royal Air Force pilot, wearing a pretty peacoat. 
We love that Kate paired navy blue with black -- a look that the fashion-savvy know is super chic, but many would be afraid to do.
Kate attended an afterparty following the opening night of Afrika Afrika, wearing an animal print dress.
Kate attended another book launch, dressed in a simple cap-sleeved dress.
Wearing a vest over long sleeves, Kate and the rowing team practice for the Charity Boat Challenge.
Sporty-chic Kate took part in a training session with the Sisterhood Cross Channel rowing team.
Looking nautical in stripes and wedges, Kate was spotted in London.
Kate attended the Concert for Diana in London, wearing a white trench and black heeled boots.
Kate smiles in a casual top and jeans in London.
The Middleton sisters looked lovely at a book launch party in London.
Kate wore a sweater and pencil skirt with boots to the Badminton Horse Trials, mastering that transitional time when Spring has a chill in the air.
Kate wore a 60s-inspired dress out and about in London.
Kate and Pippa watched William play rugby in casual jeans and boots.
For the next day of the festival, Kate went for a mix of blues and browns, wrapping it up with a pretty scarf and beret.
Back to her classic, almost professional, duds, Kate wore a matching deep green skirt and coat to the Cheltenham Festival.
Seen leaving the venue Boujis, Kate looked classic in a shimmering black jacket.
Showing off some not-often-seen skin, the now Duchess was out on the town with friends.
Kate wore this casual black and white patterned dress, arriving home from work.
Kate wore a red Armani coat to the Sovereign's Parade at the Royal Military Academy.
Kate rocked white jeans and a simple cardigan at the Beaufort Polo Club.
Dressed in casual summer whites, Kate attended the Rundle Cup Day with Chelsy Davy (Prince Harry's former girlfriend) and William's cousin Zara Phillips.
Kate wore one of her favorite silhouettes, a simple wrap dress, for a Polo match.
Kate dances with a friend at a pre-Wimbledon party, dressed in a dark floral dress.
Kate wore red and white polka dots to the Chakravarty Polo match, completing the look with strappy wedges and classic sunglasses.
Kate wore a floral dress and pink jacket to a store opening, letting her bangs fall to a fringe.
Kate attended the Boodles Boxing Ball, dressed in bright blue to support the sports charity Sparks.
Kate looked lovely in a long cream coat and fancy fascinator at a friend's wedding.
Wills made Kate laugh after she and her sister watched him play in a field game at Eton College.
Kate wore flat boots, a long coat and Russian-style fur hat at the Cheltenham Festival with her sister Pippa.
Kate and her mother, Carole Middleton, attended the Spirit of Christmas Shopping Festival in London, Kate wearing jeans and a light blue blazer.
A casual Kate out and about with her father, graduation weekend.
Kate, dressed in a casual sweater with a brown jacket, wore her hair up for the Gatcombe Horse Trials.
Kate Middleton and Prince William on the day of their graduation ceremony at St. Andrews University.
Kate at her graduation from St. Andrews, where she met Prince William.
Kate attends the wedding of a friend, wearing a lace-patterned black and white skirt with a complimentary jacket and fascinator.
Kate skis in the Klosters with William and family.
Kate with sister Pippa and Father Michael in Jerash, Jordan. The Middleton Family moved to Amman, Jordan for two and a half years.
An adorable Kate smiles at the camera, age five.
A 3 year-old Kate wearing bright stripes.
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