These are small stones that form in salivary glands in your mouth and can block your flow of saliva. They're not usually serious and you may be able to remove them yourself.
Most stones appear below your tongue in one of the tubes (glands) supplying saliva to your mouth. You can't always see them.
The stones may cause:
If you feel intense pain during mealtimes, this could mean the stone is completely blocking a saliva gland. The pain usually lasts 1 to 2 hours.
You can try to free the stone by doing things to increase saliva production, such as:
Don't use a sharp instrument to remove the stone as this could cause injury and infection.
If you have pain and swelling:
The symptoms won't go away until the stone has been removed.
Your GP may attempt to gently remove the stone with a thin, blunt instrument.
If that's not possible, you may need to have the stone removed in hospital.
It's not clear what causes salivary gland stones, so there's no way to prevent them.
They're not generally linked with any other health problems.
Salivary stones don't usually come back, but if you keep getting them you might be advised to have one of your salivary glands removed.