Hillary Clinton returned Thursday to the US presidential campaign, saying her three days off helped her "reconnect with what this campaign is about."

In her first appearance since being ordered to stay home to recuperate from pneumonia, Clinton said, "sitting at home was the last place I wanted to be" with only two months until the November 8 election.

But she told a rally in Greensboro, North Carolina, that she took advantage of the time to be alone with her thoughts, and "did some thinking" about her reasons for running for office.

Appearing rested as she addressed the crowd in a clear voice, Clinton said that being home sick reminded her that far too many people in American can't stay home when they are ill because they lack health care or are "living on the razor's edge" and can't afford to lose a paycheck.

Some things should be within reach for everyone, she said, like financial security, affordable healthcare and "the peace of mind that comes with knowing that if something goes wrong your family will be OK."

Her public service career, Clinton said, had focused on "fighting for families and everyone who's been knocked down but gets back up" and that's what she would do as president.

Clinton, 68, was sidelined from the campaign trail on Sunday after she felt dizzy and nearly collapsed after abruptly leaving a memorial service in New York for the September 11, 2001, terrorist attacks.

Clinton's campaign, which earlier in the week had said that the candidate suffered from allergies, admitted that she had been diagnosed Friday with pneumonia.

In a brief press conference Thursday, she reiterated that she had considered her sickness "an ailment that many people just power through" and hadn't thought "there was any reason to make a big fuss about it."

Her personal doctor released a two-page letter Wednesday saying the US presidential candidate is responding well to treatment for the illness.

The letter also provided a trove of other health details about the former secretary of state, who apparently hoped releasing the letter would put concerns about her health to rest.

More health-related information also came out Thursday about Donald Trump, the Republican nominee in the race for the White House. On The Dr Oz Show, he said he takes a statin to lower his cholesterol level and said he would like to lose between 7 and 9 kilograms.

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