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Oral thrush (mouth thrush)

Oral thrush is usually harmless. It's common in babies and also older people with dentures. It can be treated with antifungal medicine.

Symptoms of oral thrush

Adults

The inside of a person's mouth, which is red with lots of white patches.
When you have oral thrush, your mouth is red inside with white patches.
White patches inside a person's mouth, with a small patch of red blood.
When you wipe off the white patches, they leave red spots that can bleed.

Other symptoms in adults include:

  • cracks at the corners of your mouth
  • not tasting things properly
  • an unpleasant taste in your mouth
  • pain inside your mouth (for example, a sore tongue or sore gums)
  • difficulty eating and drinking

Oral thrush in adults is not contagious.

Babies

White coating on the top of a child's tongue.
A baby with oral thrush will have a white coating on their tongue. This may become yellow or grey, and look like cottage cheese.
White spots inside a baby's mouth.
Sometimes there are white spots in their mouth.

Babies with oral thrush may not want to feed.

If you're not sure it's oral thrush

Look at other causes of a white or sore tongue.

A pharmacist can help with oral thrush

Oral thrush can be treated with a mouth gel bought from a pharmacy. The gel is suitable for adults, children and babies over the age of 4 months.

Ask your pharmacist for advice. Always follow the instructions on the medicine packet.

When and where to get medical help

Oral thrush is not usually serious but sometimes you may need to get help from a GP.

Non-urgent advice: See a GP if:

  • your baby is under 4 months old and has signs of oral thrush
  • you have oral thrush and do not see any improvement after 1 week of treatment with a mouth gel
  • you have difficulty or pain when swallowing
  • you have symptoms of thrush and have a weakened immune system or take medicine that lowers your immune system (immunosuppressants)

How you can prevent oral thrush

Oral thrush is an infection caused by a fungus called Candida. Some things can make the fungus grow more than usual.

You might get thrush if you:

  • take antibiotics over a long time
  • use asthma inhalers
  • wear dentures
  • are having cancer treatment like chemotherapy
  • have a long-term condition such as diabetes or HIV

There are some things you can do to help prevent oral thrush.

Page last reviewed: 9 October 2026
Next review due: 9 October 2029