Bill Clinton's hand appears to tremble as he campaigns for Hillary in Iowa

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Some Concerned Over Bill Clinton's Health After Seeing His Hand Tremble

Bill Clinton's hand appeared to tremble as he campaigned for his wife in Iowa, raising questions about his health.

Observers noticed that his fingers appeared to shake as he delivered a speech over the weekend to a crowd of 5,000. In the past, he's said it's simply a condition of aging.

READ MORE: Bill Clinton Campaigns For Hillary After She's Heckled Over His Past

In 2013, Clinton denied he had Parkinson's disease, saying: "I have a condition that sometimes you get with aging. You may have noticed it; my hand has a little tremor when I'm tired and a lot of people do when they're older."

See recent photos of Bill Clinton on the campaign trail:

21 PHOTOS
Bill Clinton campaigns for Hillary Clinton
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Bill Clinton's hand appears to tremble as he campaigns for Hillary in Iowa
NEWTON, MA - MARCH 1: President Bill Clinton greets people at the Newton Free Library in Newton, Mass., during Massachusetts primary voting on March 1, 2016. (Photo by Lane Turner/The Boston Globe via Getty Images)
NEWTON, MA - MARCH 1: President Bill Clinton greets people at the Newton Free Library in Newton, Mass., during Massachusetts primary voting on March 1, 2016. (Photo by Lane Turner/The Boston Globe via Getty Images)
NEWTON, MA - MARCH 1: President Bill Clinton greets people at the Newton Free Library in Newton, Mass., during Massachusetts primary voting on March 1, 2016. (Photo by Lane Turner/The Boston Globe via Getty Images)
NEWTON, MA - MARCH 1: President Bill Clinton greets people at the Newton Free Library in Newton, Mass., during Massachusetts primary voting on March 1, 2016. (Photo by Lane Turner/The Boston Globe via Getty Images)
NEWTON, MA - MARCH 1: President Bill Clinton greets people at the Newton Free Library in Newton, Mass., during Massachusetts primary voting on March 1, 2016. (Photo by Lane Turner/The Boston Globe via Getty Images)
RIVIERA BEACH, FL - FEBRUARY 15: President Bill Clinton campaigns for Hillary Clinton at Port of Palm Beach on February 15, 2016 in Riviera Beach, Florida. (Photo by Mychal Watts/WireImage)
MANCHESTER, NH - FEBRUARY 08: Former U.S. president Bill Clinton speaks during a 'Get Out The Vote Clinton Family Event' for democratic presidential candidate former Secretary of State Hillary Clinton at Manchester Community College on February 8, 2016 in Manchester, New Hampshire. With one day to go before the New Hampshire primaries, Hillary Clinton continues to campaign throughout the state. (Photo by Justin Sullivan/Getty Images)
Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, left to right, speaks as her husband Bill Clinton, former U.S. president, and their daughter Chelsea Clinton look on during a primary night event in Hooksett, New Hampshire, U.S., on Tuesday, Feb. 9, 2016. Clinton congratulated Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, on his victory in her concession speech in Hooksett and vowed to battle on, saying she knows how to get results voters are demanding. Photographer: Daniel Acker/Bloomberg via Getty Images
UNITED STATES - JANUARY 16 - Former President Bill Clinton reaches for a hand after a campaign event as he helps promote his wife, democratic presidential candidate Hillary Rodham Clinton, in Des Moines, Iowa, on Saturday, Jan. 16, 2016. (Photo By Al Drago/CQ Roll Call)
Bill Clinton, former U.S. President and husband of Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, center, takes a 'selfie' photographs after speaking at a campaign rally at Exeter Town Hall in Exeter, New Hampshire, U.S., on Monday, Jan. 4, 2016. After spending the first eight months of his wifes candidacy behind the scenes, advising and fundraising out of sight of voters and the media, the never-shy former president is upping his level of public engagement starting today. Photographer: Andrew Harrer/Bloomberg via Getty Images
UNITED STATES - JANUARY 16 - Chelsea Clinton listens as her father, former President Bill Clinton speaks at a campaign event as they help promote his wife, democratic presidential candidate Hillary Rodham Clinton, in Des Moines, Iowa, on Saturday, Jan. 16, 2016. (Photo By Al Drago/CQ Roll Call)
UNITED STATES - JANUARY 16 - Former President Bill Clinton speaks at a campaign event along with his daughter, Chelsea Clinton, as they help promote his wife, democratic presidential candidate Hillary Rodham Clinton, in Des Moines, Iowa, on Saturday, Jan. 16, 2016. (Photo By Al Drago/CQ Roll Call)
MARSHALLTOWN, IA - JANUARY 15: Former U.S. President Bill Clinton greets guests after speaking at a campaign event for his wife, Democratic presidential candidate and former U.S. Secretary of State Hillary Clinton, at Marshalltown Community College on January 15, 2016 in Marshalltown, Iowa. Both Republican and Democratic presidential candidates and their surrogates have been making appearances at events across Iowa to build support in advance of the 2016 Iowa Caucuses. (Photo by Charles Ledford/Getty Images)
Hillary Clinton, former U.S. secretary of state and 2016 Democratic presidential candidate, right, stands on stage with husband Bill Clinton, former U.S. president, at the conclusion of the Jefferson-Jackson Dinner in Des Moines, Iowa, U.S., on Saturday, Oct. 24, 2015. With Vice President Joe Biden officially out of the presidential race, the nation's first nominating contest between front-runner Clinton and Senator Bernie Sanders is gaining steam, according to a new Bloomberg Politics/Des Moines Register Iowa Poll. Photographer: Daniel Acker/Bloomberg via Getty Images
Former president of the United States Bill Clinton delivers his speech during a commemorative rally in memory of late Israeli prime minister Yitzhak Rabin, at Rabin Square in the Israeli coastal city of Tel Aviv on October 31, 2015. The rally is part of commemorations marking the 20th anniversary of Rabin's killing by a right-wing Jewish extremist. AFP PHOTO / THOMAS COEX (Photo credit should read THOMAS COEX/AFP/Getty Images)
Bill Clinton, former U.S. President and husband of Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, arrives to speak during a rally ahead of the Jefferson-Jackson Dinner in Des Moines, Iowa, U.S., on Saturday, Oct. 24, 2015. Clinton's odds of winning the Democratic presidential nomination are now at or near an all-time high, according to prediction markets PredictWise, Pivit, and PredictIt. Photographer: Daniel Acker/Bloomberg via Getty Images
Former Secretary of State Hillary Clinton and Former US President Bill Clinton hug after she officially launched her campaign for the Democratic presidential nomination during a speech at the Franklin D. Roosevelt Four Freedoms Park on Roosevelt Island June 13, 2015 in New York. Hillary Clinton announced Saturday she was running for president for all Americans, unveiling a progressive platform promising to promote equal opportunity and fight for a beleaguered middle class. AFP PHOTO / TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
NEW YORK, NY - JUNE 13: People cheer after Democratic Presidential candidate Hillary Clinton stands on stage with her husband former president Bill Clinton after her official kickoff rally at the Four Freedoms Park on Roosevelt Island in Manhattan on June 13, 2015 in New York City. The long awaited speech at a historical location associated with the values Franklin D. Roosevelt outlined in his 1941 State of the Union address, is the Democratic the candidateÃs attempt to define the issues of her campaign to become the first female president of the United States. (Photo by Spencer Platt/Getty Images)
NEW YORK, NY - JUNE 13: People cheer as Democratic Presidential candidate Hillary Clinton stands on stage with her husband former president Bill Clinton after her official kickoff rally at the Four Freedoms Park on Roosevelt Island in Manhattan on June 13, 2015 in New York City. The long awaited speech at a historical location associated with the values Franklin D. Roosevelt outlined in his 1941 State of the Union address, is the Democratic the candidateÃs attempt to define the issues of her campaign to become the first female president of the United States. (Photo by Spencer Platt/Getty Images)
Former U.S. president Bill Clinton makes remarks at the Hillary Victory Fund "I'm With Her" benefit concert for his wife, U.S. Democratic presidential candidate Hillary Clinton, at Radio City Music Hall in the Manhattan borough of New York City, March 2, 2016. REUTERS/Mike Segar
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During the 69-year-old's speech, he explained why his wife partnered with Wall Street after the 9/11 attacks.

He said: "She was making the point that the people devastated on 9/11 were people to her, not categories."

Bill Clinton was also a topic during the Democratic debate on Sunday night. Senator Bernie Sanders was asked to explain his recent comments about the former president.

Moderator Andrea Mitchell asked Sanders: "You've called Bill Clinton's past transgressions 'totally, totally disgraceful and unacceptable.' Senator, do you regret saying that?"

See Bill and Hillary Clinton through the years:

13 PHOTOS
Bill Clinton and Hillary Clinton through the years
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Bill Clinton's hand appears to tremble as he campaigns for Hillary in Iowa
FILE WASHINGTON, DC - JAN 6, 1994: President Bill Clinton is escorted by Hillary to a waiting helicopter. The president was leaving for Arkansas after learning of the death of his mother. (Photo by Margaret Thomas/The Washington Post via Getty Images)
US Secretary of State Hillary Clinton (L) and US President barack Obama (R) are greeted by Myanmar pro-democracy leader Aung San Suu Kyi (C) at her residence in Yangon on November 19, 2012 . Obama arrived in Myanmar for a historic visit aimed at encouraging a string of dramatic political reforms in the former pariah state. AFP PHOTO / Nicolas ASFOURI (Photo credit should read NICOLAS ASFOURI/AFP/Getty Images)
US Secretary of State Hillary Clinton (L) looks on as US President Barack Obama (2nd L) speaks during a bilateral meeting with Japanese Prime Minister Yoshihiko Noda (2nd R) on the sidelines of the East Asian Summit at the Peace Palace in Phnom Penh on November 20, 2012. During the two-day East Asia Summit in Phnom Penh, Obama was scheduled to hold talks with the leaders of the 10-member Association of Southeast Asian Nations (ASEAN) along with Chinese Premier Wen Jiabao and Japan's Yoshihiko Noda. AFP PHOTO / Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
US President Barack Obama and Secretary of State Hillary Clinton board Air Force One at the airport in Yangon on November 19, 2012. Huge crowds greeted Barack Obama in Myanmar on the first visit by a serving US president to the former pariah state to encourage a string of startling political reforms. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
US President Barack Obama(2nd-L), First Lady Michelle Obama(L) along with former president Bill Clinton(3rd-L) and former secretary of state Hillary Clinton(4th-L) take part in a wreath-laying ceremony in honour of the late 35th president of the US John F. Kennedy at Kennedy's gravesite in Arlington National Cemetery on November 20, 2013 in Arlington, Virginia. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
BERLIN, GERMANY - JULY 06: Copies of the German translation of the book 'Hard Choices' ('Entscheidungen' in German) by Hillary Rodham Clinton, former United States Secretary of State, U.S. Senator, and First Lady of the United States, stand on display at the Staatsoper in the Schiller Theater on July 6, 2014 in Berlin, Germany. (Photo by Adam Berry/Getty Images)
BERLIN, GERMANY - JULY 06: Hillary Rodham Clinton, former United States Secretary of State, U.S. Senator, and First Lady of the United States, speaks during the presentation of the German translation of her book 'Hard Choices' ('Entscheidungen' in German) at the Staatsoper in the Schiller Theater on July 6, 2014 in Berlin, Germany. (Photo by Adam Berry/Getty Images)
AUSTIN, TX - JUNE 20: Hillary Rodham Clinton appears on stage during 'A Conversation With Former Secretary of State Hillary Rodham Clinton' at the Long Center on June 20, 2014 in Austin, Texas. (Photo by Gary Miller/Getty Images)
BERLIN, GERMANY - JULY 06: Hillary Rodham Clinton, former United States Secretary of State, U.S. Senator, and First Lady of the United States (R), speaks next to Christoph Amend, editor in chief of Zeit Magazin, during the presentation of the German translation of her book 'Hard Choices' ('Entscheidungen' in German) at the Staatsoper in the Schiller Theater on July 6, 2014 in Berlin, Germany. (Photo by Adam Berry/Getty Images)
EAST HAMPTON, NY - AUGUST 16: Hillary Rodham Clinton signs copies of her book 'Hard Choices' at BookHampton on August 16, 2014 in East Hampton, New York. (Photo by Sonia Moskowitz/Getty Images)
OAKLAND, CA - JULY 23: Former Secretary of State Hillary Clinton speaks during a during a round table event to launch the 'Talking is Teaching: Talk Read Sing' campaign at the Children's Hospital Oakland Research Institute on July 23, 2014 in Oakland, California. Former Secretary of State Hillary Clinton launched the 'Talking is Teaching; Talk Read Sing' campaign in partnership withToo Small to Fail and the Bill, Hillary and Chelsea Foundation that encourages parents and caregivers to close the word gap by talking, singing and reading to children every day from the birth. (Photo by Justin Sullivan/Getty Images)
NEW YORK, NY - JANUARY 06: Former president of United States (US) Bill Clinton (R) and his wife, former US Secretary of State Hillary Clinton (L), leave St. Ignatius Loyola Church after the funeral of former three-term governor Mario Cuomo on January 6, 2015 in New York City. (Photo by Selcuk Acar/Anadolu Agency/Getty Images)
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Sanders hit back: "That question annoys me... Yes, his behavior was deplorable. Have I ever once said a word about that issue? No, I have not. I'm going to debate Secretary Clinton, Governor O'Malley, on the issues facing the American people, not Bill Clinton's personal behavior."

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Hillary Clinton only discussed what role her husband would play in her administration, saying: "Well, it'll start at the kitchen table, we'll see how it goes from there."

She added: "I'm going to use him as a goodwill emissary to go around the country to find the best ideas we've got, because I believe, as he said: 'Everything that's wrong with America has been solved somewhere in America.'"

SEE MORE: Donald Trump Attacks Bill Clinton: There Was Certainly Abuse of Women

Donald Trump Attacks Bill Clinton: There Was Certainly Abuse of Women

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