A JAGGED crystal peed out by a poor man left people wincing in pain as his girlfriend shared a video of the "evil" lump.
The young man had to pass out a kidney stone through his urethra in what would have been a horrifying experience.
And in a clip sampled by TikTok's favourite NHS surgeon Dr Karan Rajan, his stunned girlfriend is looking at the kidney stone with tweezers.
She holds it to the camera while explaining her boyfriend just peed it out – the common but painful way to get rid of a crystal.
The shocked woman, called Lauren, says: "My poor boyfriend just peed this out.
"Poor urethra, I never knew kidney stones could be so evil. Look at that sharp little razor tip."
One person watching the video wrote: "This hurts me watching this."
And another said: "This made me go and drink three glasses of water."
While one other viewer said they had suffered with kidney stones and revealed it "feels like you are urinating glass shards".
Kidney stones are masses made of salt and minerals, and can be anywhere between a grain of salt and a golf ball in size.
There are several different types, calcium stones, struvite stones, uric acid stones and cystine stones.
Kidney stones are incredibly painful, with many sufferers claiming that the experience is one they will never forget.
The stones have potential to cause severe pain, and while most pass on their own through the ureter – the tube between the kidney and the bladder – some require to be medically removed with surgery.
Dr Rajan explained ten per cent of people are likely to get kidney stones in their lives.
But he revealed what you can do to try and avoid the painful condition.
He said: "Strangely enough, low calcium can actually cause kidney stones.
"You need to get enough calcium in your diet so it can bind to oxalates in your stomach and intestines before it moves to the kidneys.
"Eating foods with calcium is a good way for oxalates to leave the body and not form stones."
Oxalate is found in some foods and is also produced as a waste product in the body.
He added: "Don't go overboard with the salt. Excessive salt in the diet can keep calcium from being absorbed, leading to kidney stones.
"Animal proteins contain purines, and eating too much can cause uric acid to build up in your urine, increasing the risk of stones."
While meat is a good source of protein there are other ways you can get the right amount.
Foods such as eggs and dairy products are also great sources of protein.
If you follow a vegan diet then foods such as seitan, tofu, tempeh, and edamame are all also great sources of protein.
The NHS doctor also said genetics and family history can leave people more predisposed to developing kidney stones.
What are the symptoms of kidney stones?
- Severe pain in the side and back, below the ribs
- Pain that radiates to the lower abdomen and groin
- Pain that comes in waves and fluctuates in intensity
- Pain on urination
- Pink, red or brown urine
- Cloudy or foul-smelling urine
- Nausea and vomiting
- Persistent need to urinate
- Urinating more often than usual
- Fever and chills if an infection is present
- Urinating small amounts
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