Hillary Clinton has a BODY DOUBLE? - Watch

Critics say the woman who emerged from Chelsea Clinton`s apartment was a lookalike and not the real Hillary Clinton.

New York: US presidential candidate Hillary Clinton has released a letter from her doctor declaring her fit for the presidency.

She has been resting at her home in Chappaqua, New York, after falling ill on Sunday morning as she left a September 11 memorial in New York City.

Video footage taken by a bystander showed Hillary becoming dizzy as she attempted to get into a waiting vehicle. Her campaign said later in the day that the former secretary of state had been diagnosed with pneumonia on Friday.

The delay in public disclosure fuelled criticism that she is prone to secrecy and fed unsubstantiated Internet rumours that she is hiding a health issue.

This also gave conspiracy theorists a chance to claim that Hillary, 68, used a body double after her medical episode on Sunday.

On the social media, people were comparing the pictures of Hillary when she was emerging from her daughter Chelsea Clinton's house just hours after she collapsed to her earlier pictures to draw attention to supposed 'physical differences'.

Critics say the woman who emerged from Chelsea’s apartment was a lookalike and not the real Hillary.

Conspiracy theorists make their case by claiming that Hillary looked slimmer, wore dark glasses to hide her eyes as she emerged from Chelsea's apartment.

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The health scare had forced the 68-year-old former secretary of state to cancel campaign and fundraising trips to California and has fuelled concerns about her medical fitness less than two months to go for the November 8 election.

She is set to resume her champaign today.