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He adds that not letting a fart out can have gross consequences.
He says in the video: "If you hold in a fart too long it can be reabsorbed into your bloodstream and breathed out when you exhale."
That doesn't sound too good.
If you've ever wondered why farts make such a brilliant noise, well here's your lucky day because you're about to find out.
Dr Karan says: "The noise of a fart is a combo of an anal sphincter vibrations and the percussion of butt cheeks against each other.
"Fart velocity and butt hole tightness determine the sound... anal embouchure."
The TikTok doctor also says that '75 percent of farts are produced by bacteria in the large intestine'.
He adds that 'your average daily fart volume is enough to fill up a medium-sized balloon'.
He continues: "Digested food that isn't broken down is chewed up by bacteria that produce microscopic farts that accumulate and become one of your regular farts.
"25 percent of farts is swallowed air that you don't burp and dissolved gasses from circulation."
Perhaps one of the most important facts is that '99 percent of farts are non-stinky gases', with the 1 percent that does smell made up of 'volatile sulphur compounds like hydrogen sulphide'.
His TikTok was posted two days ago (6 September) and has racked up 2.5 million views and received 217,500 likes.
As expected, users were absolutely loving this one.
One user wrote: "I farted during this video."
Whilst a second added: "I can fill a hot air balloon on a good day."
A third user admitted: "My bedtime fart is the worst haha."
Dr Raj explained: "Yes a whole day's worth of bacteria recycling your food into foul farts."
That might explain those questionable smells you give out after a curry.