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It comes after the Democratic presidential nominee appeared to collapse after making a hasty exit from a September 11 memorial event.

Initially, aides working on her behalf said she had been feeling faint after "overheating".

However, after video evidence emerged showing her appearing to stumble as she got into a waiting car, her team released a statement saying she was actually suffering from pneumonia.

(Image: GETTY)

In the hours after her medical emergency, there was widespread speculation that she was preparing to drop out of the race altogether.

The Democrat Party had been expected to call a meeting to discuss replacing her, with sources saying she hid her illness for three days.

She has also cancelled a number of planned visits to California today and tomorrow.

But now, rumours are emerging that Clinton may actually have lung or tongue cancer.

As speculation over her health continues, she returned to the campaign trail last night.

At a rally in North Carolina, where James Brown's I Feel Good was played as she emerged on stage, she said: "With just two months to go until election day, sitting at home was pretty much the last place I want to be.

"People accuse me of all kinds of things. You probably have seen that, but nobody ever accuses me of quitting and I will never give up, I'll never walk away, no matter how tough the going gets."

Numerous Twitter users have speculated she may have the horrific illnesses and posted video evidence in which she apparently has symptoms.

She has been caught on camera numerous times ove the past year dissolving into uncontrollable coughing fits while making speeches.

Symptoms of lung cancer include: A persistant cough, chronic pneumonia, chest pain, feeling tired or week and weight loss.

Former U.S. Secret Service agent Dan Bongino fuelled rumours she has a major health problem too after seeing the footage of her being bundled into the waiting car on September 11.

He told Breitbart News: "One of the things about that video that kind of dictates to me how severe the situation was, is, if you look at that video of her getting in the van, look to the left, and you’ll see two white shirts with the NYPD. That means they’re supervisors. They’re probably lieutenants, or sergeants, meaning they probably have ten years on the job, or above. These are seasoned street cops. They see her and watch how quickly they move right over to the vehicles. They don’t care about the Secret Service, or anything. They walk right over to her.

"That says to me they saw something not in that camera angle, and they knew she was in a health crisis."

(Image: GETTY)

Rumours about the 68-year-old having a form of mouth cancer first surfaced when she was pictured with what appeared to be a large hole in her tongue.

Conspiracy theorists on the web went into overdrive posting close-up photos of her mouth, alleging it was evidence of the illness.

Shortly after her appearnce at the Democratic Natonal Convention in Philadelphia – where she accepted the presidential nomination – Twitter users started posting screengrabs of her wide open mouth under the hashtag #HillarysTongue.

Many pointed out that the most common tongue cancer symptoms are: a lump of thickening inside the mouth, a persistant feeling something is caught in the throat, a white or red patch inside the mouth.

Since the pneumonia announcement, her White House race rival Donald Trump pledged to release all of his medical records.

Rumours about the Democrat Presidential wannabe are unlikely to go away though, with instense speculation about her health constantly growing.

Just days ago, a sick hoax emerged saying she had died after her collapse.