AN NHS surgeon has revealed the grim reason why diarrhoea is like having a bum "on fire" – and people are disgusted.

Dr Karan Rajan, who has racked up a large TikTok following on his @dr.karanr account, said the reason is down to stomach acid still being in your faecal matter.

He explained: "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 exclaims: "Fire in the hole!"

Dr Karan’s video has been watched more than 4.5 million times, and many people said they had experienced the burning sensation.

One said: "Oh ring sting isn't great."

Another added: "It's like I'm passing lit matches."

Diarrhoea can have many different causes, including infection, too much alcohol, too much caffeine and some medication.

It's caused by an excess of water in the intestines, which loosens bowel movements.

Researchers concluded that diarrhoea does play a critical role in clearing the early stages of an infection.

But that does not mean you should be experiencing diarrhoea regularly.

If you are experiencing persistent diarrhoea you should speak to your GP.

This is why you can get diarrhoea on your period…and the best way to deal with it.

And it may sound gross but diarrhoea is actually GOOD for you.

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