Symptoms of Mouth Ulcers

You will usually know if you have a mouth ulcer by looking at its appearance. A mouth ulcer will be:

  • round, or oval, in shape,
  • white, yellow, or grey in colour, and
  • inflamed around the edge.

Most mouth ulcers usually occur on:

  • the inside of the lips,
  • the inside of the cheeks,the floor of the mouth, or
  • the under surface of the tongue.

An ulcer can cause pain and discomfort, particularly when eating, drinking or brushing your teeth.

Most mouth ulcers will only last between 10-14 days, although in more severe cases, they may last for several weeks.

If your mouth ulcer gets progressively more painful and inflamed, you should see your GP. You should also see your GP if your mouth ulcer lasts for more than three weeks, or if ulcers appear else where on your body, such as the genitals.


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