CONSPIRACY theorists have moved into overdrive alleging Hillary Clinton used a “body double” after her dramatic public collapse on September 11.

Many claim the Presidential hopeful and her team called on political impersonator Teresa Barnwell to stand in after Hillary was struck down with "walking pneumonia".

4 A rejuvenated Hillary just two hours after her much-publicised collapse ... but is it really her? Credit: AP:Associated Press

#HillarysBodyDouble Clinton's 'body double twin', Teresa Barnwell, 61, earns $1000's monthly impersonating Hillary pic.twitter.com/Wx36rO58aZ — Only 6% of 185K+ deaths were COVID19 🚫😷 (@aworldoftruth) September 12, 2016

4 Hillary Clinton lookalike Teresa Barnwell has denied she stood in for Hillary Credit: Caters News Agency

The 68-year-old sparked big fears for her health after being filmed stumbling into her motorcade after attending the 9/11 memorial service in New York.

She was then taken to her daughter Chelsea’s apartment to rest and emerged two hours later smiling, posing for photographs and telling everyone: "I’m feeling great. It’s a beautiful day in New York."

It is this 'miracle' recovery which quickly set the conspiracists' tongues wagging.

They say the person who exited the apartment building with a sprightly step was not Hillary.

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Theorists point out her legs were too skinny, her nose was shaped slightly differently and her earlobes were a different size than they normally are. Other claim her fingers seem to have grown.

The rumour quickly took off on Twitter with more "facts" to prove the double was used.

Many pointed out the lack of secret service officers near the Presidential candidate.

Images circulating under the #HillarysBodyDouble hashtag contrasted enhanced photographs of her earlier in the day.

4 A tired looking Hillary at the 9/11 event just before her collapse Credit: Getty Images 4 The shocking moment Hillary collapses Credit: Zdenek Gazda via Storyful

Later in the day impersonator Teresa Barnwell tweeted to say she wasn't even in New York that day.

Clinton’s doctor Lisa R. Bardack said in a statement that following the candidate’s Friday diagnosis, “she was put on antibiotics, and advised to rest and modify her schedule".

Her symptoms on Sunday were a result of overheating and dehydration, Bardack said, adding: “She is now re-hydrated and recovering nicely.”