Hillary Clinton leaves 9/11 memorial event early after feeling 'overheated'

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Democratic presidential candidate Hillary Clinton on Sunday became "overheated" at a Sept. 11 memorial ceremony in New York City and departed the event early, according to a campaign spokesman.

Clinton left the New York event and went to daughter Chelsea Clinton's apartment and was "feeling much better," according to her spokesman Nick Merrill.

Click through photos of Clinton at 9/11 event:

18 PHOTOS
Clinton overheats at 9/11 event
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Clinton overheats at 9/11 event
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton arrives with an unidentified woman at the September 11 Commemoration Ceremony at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton left a September 11 Commemoration Ceremony early after feeling overheated and went to her daughter's house to rest. (Photo by Justin Sullivan/Getty Images)
TOPSHOT - Democratic presidential nominee Hillary Clinton leaves a memorial service at the National 9/11 Memorial September 11, 2016 in New York. The United States on Sunday commemorated the 15th anniversary of the 9/11 attacks. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
U.S. Democratic presidential candidate Hillary Clinton, New York Mayor Bill de Blasio (R) and U.S. Senator Chuck Schumer attend ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton attends the September 11 Commemoration Ceremony at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton and Donald Trump attended the September 11 Commemoration Ceremony. (Photo by Justin Sullivan/Getty Images)
U.S. Democratic presidential candidate Hillary Clinton attends ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
U.S. Democratic presidential candidate Hillary Clinton leaves ceremonies marking the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
U.S. Democratic presidential candidate Hillary Clinton arrives for ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
U.S. Democratic presidential candidate Hillary Clinton and New York Mayor Bill de Blasio (R) attend ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
U.S. Democratic presidential candidate Hillary Clinton, New York Mayor Bill de Blasio (R) and U.S. Senator Chuck Schumer attend ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder
Democratic presidential nominee Hillary Clinton leaves a memorial service at the National 9/11 Memorial September 11, 2016 in New York. The United States on Sunday commemorated the 15th anniversary of the 9/11 attacks. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton (C) attends the September 11 Commemoration Ceremony with New York city mayor Bill de Blasio (R) and U.S. Sen. Chuck Schumer (D-NY) (L) at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton and Donald Trump attended the September 11 Commemoration Ceremony. (Photo by Justin Sullivan/Getty Images)
Democratic presidential candidate Hillary Clinton arrives to attend a ceremony at the National September 11 Memorial, in New York, Sunday, Sept. 11, 2016, on the 15th anniversary of the Sept. 11 attacks. (AP Photo/Andrew Harnik)
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton leaves the home of her daughter Chelsea Clinton on September 11, 2016 in New York City. Hillary Clinton left a September 11 Commemoration Ceremony early after feeling overheated and went to her daughter's house to rest. (Photo by Justin Sullivan/Getty Images)
US Democratic presidential nominee Hillary Clinton leaves her daughter's apartment building after resting on September 11, 2016 in New York. Clinton departed from a remembrance ceremony on the 15th anniversary of the 9/11 attacks after feeling 'overheated,' but was later doing 'much better,' her campaign said. / AFP / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
U.S. Democratic presidential candidate Hillary Clinton leaves her daughter Chelsea's home in New York, New York, United States September 11, 2016, after Clinton left ceremonies commemorating the 15th anniversary of the September 11 attacks feeling "overheated." REUTERS/Brian Snyder TPX IMAGES OF THE DAY
U.S. Democratic presidential candidate Hillary Clinton leaves ceremonies marking the 15th anniversary of the September 11 attacks at the National 9/11 Memorial in New York, New York, United States September 11, 2016. REUTERS/Brian Snyder TPX IMAGES OF THE DAY
NEW YORK, NY - SEPTEMBER 11: Democratic presidental nominee former Secretary of State Hillary Clinton leaves the September 11 Commemoration Ceremony at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton and Donald Trump attended the September 11 Commemoration Ceremony. (Photo by Justin Sullivan/Getty Images)
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News of a "medical episode" started to appear shortly after Clinton departed from the ceremony. According to FOX News, the former secretary of state stumbled off the curb, her "knees buckled" and one of her shoes fell off as she was helped into a van as she made her "unexpected early departure."

After her departure, reporters following the Democratic nominee on the campaign trail were prevented from leaving the media area for a period of time.

Temperatures were in the high 70s and low 80s Sunday morning in New York City during the event.

Following the incident, the presidential candidate told reporters she was "feeling great" upon leaving her daughter Chelsea's home in Manhattan, where she was taken after departing the memorial service.

The episode comes amid concerns from some critics who suggest the 68-year-old presidential candidate may be suffering health issues, citing repeated coughing spells on the campaign trail. Republican nominee Donald Trump has echoed such concerns, but has yet to comment on Clinton's health following the 9/11 event.

Clinton's personal physician released a letter in July describing her as being in "excellent health" and "fit to serve."

Click through to see moments on campaign trail that have some concerned about Clinton's health:

11 PHOTOS
Moments on the trail that have some concerned over Hillary Clinton's health
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Moments on the trail that have some concerned over Hillary Clinton's health
Democratic presidential candidate Hillary Clinton stops her speech to cough at the 11th Congressional District Labor Day festival at Luke Easter Park in Cleveland, Ohio, Monday, Sept. 5, 2016. (AP Photo/Andrew Harnik)
Democratic presidential candidate and former Secretary of State Hillary Rodham Clinton, has a throat lozenge during a coughing fit in the final hour of a marathon testimony on Capitol Hill in Washington, Thursday, Oct. 22, 2015, before the House Select Committee on Benghazi. (AP Photo/Jacquelyn Martin)
Democratic presidential candidate Hillary Clinton holds up a glass of water as she struggles to contain a coughing fit as she speaks at the Jewish Federation of Greater Des Moines while campaigning in Des Moines, Iowa January 25, 2016. REUTERS/Rick Wilking
U.S. Democratic presidential candidate Hillary Clinton leaves ceremonies marking the 15th anniversary of the September 11 attacks at the National 9/11 memorial The Hillary Clinton campaign disclosed she had been diagnosed with pneumonia, after a social media video appeared to show her swaying and her knees buckling as she left the memorial ceremony in New York. REUTERS/Brian Snyder 
Democratic presidential candidate Hillary Clinton pauses to drink water after coughing as she speaks at the 11th Congressional District Labor Day festival at Luke Easter Park in Cleveland, Ohio, Monday, Sept. 5, 2016. (AP Photo/Andrew Harnik)
MANHATTAN, NEW YORK CITY, UNITED STATES - 2016/02/16: Mrs. Clinton interrupted by coughing spasm during her speech. Presidential candidate and former secretary of state Hillary Rodham Clinton spoke at Shomburg Center on her plans for strengthening the Black community and improving opportunity for minorities if elected president. (Photo by Andy Katz/Pacific Press/LightRocket via Getty Images)
Democratic presidential candidate Hillary Clinton pauses to drink water after coughing as she speaks at the 11th Congressional District Labor Day festival at Luke Easter Park in Cleveland, Ohio, Monday, Sept. 5, 2016. (AP Photo/Andrew Harnik)
CLEVELAND, OH - SEPTEMBER 05: Democratic presidential nominee former Secretary of State Hillary Clinton pauses to take a drink of water to help soothe a cough during a campaign rally at Luke Easter Park on September 5, 2016 in Cleveland, Ohio. Clinton is kicking off a Labor Day campaign swing to Ohio and Iowa on a new campaign plane large enough to accommodate her traveling press corp. (Photo by Justin Sullivan/Getty Images)
SAN FRANCISCO, CA - MAY 26: Cough drops and a microphone sit on a stool for democratic presidential candidate former Secretary of State Hillary Clinton during a campaign event on May 26, 2016 in San Francisco, California. Hillary Clinton is campaigning in the San Francisco Bay Area ahead of California's presidential primary on June 7th. (Photo by Justin Sullivan/Getty Images)
Democratic presidential candidate Hillary Clinton struggles to contain a coughing fit as she speaks at the Jewish Federation of Greater Des Moines while campaigning in Des Moines, Iowa January 25, 2016. REUTERS/Rick Wilking
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