Hillary Clinton suffered similar illness after working 'like a demon': Bill

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Hillary Clinton has previously suffered "the same sort" of illness that saw her abruptly leave this weekend's Sept. 11 memorial, Bill Clinton said Monday.

The Democratic nominee appeared unsteady as she departed Sunday's event. Her campaign said she felt "overheated" and later disclosed she had been diagnosed with pneumonia two days previously.

See some of the coughing fits and other moments that sparked concern over Clinton's health:

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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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"Rarely, but on more than one occasion of the last many, many years, the same sort of thing's happened to her where she got severely dehydrated," Bill Clinton told Charlie Rose in an interview that aired on PBS on Monday. "She's worked like a demon, as you know, as secretary of state and as a senator and in the years since."

RELATED: Pneumonia hospitalization rates

Hillary Clinton was now "doing fine" and " looked like a million bucks [Monday] morning," according to her husband.

Asked if she might be forced to take a longer break from campaigning, he added: "No — not a shot. I'll be lucky to hold her back another day."

He said there was "nothing more to know" about her illness and that his wife had merely become dehydrated.

RELATED: Clinton leaves 9/11 event early after becoming "overheated"

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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"People faint at my political rallies sometimes and I'm so old I'm sure it's not due to them swooning," he told Rose. "Well over 90 percent of the people I've seen collapse at political rallies, usually it's quite hot, and it's almost always because of dehydration."

Bill Clinton added that his wife's "lifestyle and her underlying indicators, from blood pressure to the amount of exercise to everything else, means she's almost certainly in better health than her opponent."

RELATED: Pneumonia overview

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