A doctor famed for sharing medical advice in short TikTok videos has given an easy hack to check if you're hydrated or need to drink more water.
Dr Karan Rajan, an NHS surgeon, uses social media platform TikTok to explain medical situations to millions of viewers.
He explained an easy way to check if you're dehydrated is to pinch the middle of your finger.
This is known as a skin pinch or skin turgor test.
The more hydrated you are the more elastic your skin will be and it will bounce back immediately after pinching it.
If you're dehydrated the skin loses elasticity and it takes a while to return to normal and tents up.
Dr Rajan put out the video in 2021 and said it blew up online more than he thought it would.
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