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An NHS surgeon with a huge TikTok following has explained to his fans why diarrhoea is like having a bum "on fire" – and it's not for the faint-hearted.
In a video uploaded on Saturday, May 22, Dr Karan Rajan @dr.karanr said the pain was caused by acid and enzymes attacking the skin.
The surgeon, who is also on Instagram, said: "Just so you know, the reason why your bum is on fire when you have diarrhoea is because it is being digested by your body.
"This means stomach acid, digestive enzymes, and bile are still present in the diarrhoea.
"These can damage and digest the tissues in your rectum and cause a burning sensation."
He then cups his mouth and yells: "Fire in the hole!"
Since it was uploaded, the footage has been watched more than 4.5 million times and many people confessed they had suffered from similar pain.
One viewer commented: "It's something I was always curious about but didn't care enough to Google. Thanks."
A second fan wrote: "Oh ring sting isn't great."
"I wish I could unknow this," pleaded someone else.
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Sharing with graphic detail, a fourth user commented: "It's like I'm passing lit matches."
According to information published online by the NHS, diarrhoea is normally caused by gastroenteritis, norovirus, or food poisoning.
The symptoms should stop after seven days but you should not go to work until you've not been sick or had diarrhoea for at least two days, it added.
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Paracetamol and rehydration sachets can be useful but you should phone ahead before going into a pharmacy because norovirus is very contagious and the medicine could be delivered instead.
This comes after the doctor explained the weird science of déjà vu and called it a "brain glitch" that affects some people more than others.
He also revealed that surgeons will shave your pubes while you sleep and listen to many different genres of music while they operate, including drum and bass.
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