Geographic tongue

Geographic tongue is a common, harmless condition.

It usually appears on the top or sides of the tongue.

The tongue develops irregular, smooth red patches with pale or white edges.

These shapes can resemble a map outline, which is why it’s called geographic tongue.

Why does this happen?

Geographic tongue occurs when the tongue's surface sheds and renews itself unevenly.

This means:

• In some areas, the top layer of skin comes away too early, leaving a red, sore patch.

• In other areas, the skin stays for longer, creating white or pale patches.

Because the red patches are thinner than normal, they can be more sensitive and more prone to infections, such as oral thrush.

Who does it affect?

Geographic tongue:

• Can affect people of all ages and sexes.

• Is often first noticed in childhood.

• Can run in families.

• Is not an infection and cannot be passed on to others.

What symptoms might I notice?

Many people have no symptoms at all.

Things you might notice include:

• Soreness or a burning feeling on the tongue.

• Sensitivity when eating certain foods.

• Patches that change shape or move over time.

What can make it worse?

The thin red patches can be irritated by:

• Acidic foods and drinks, such as citrus fruits or juices.

• Hot or spicy foods, including chillies.

• Very salty foods.

Avoiding these can help reduce discomfort.

How is geographic tongue treated?

There is no specific treatment, and most people do not need one.

What can help:

• Avoid foods and drinks that make your tongue sore.

• Keep your mouth clean with gentle brushing.

• If you develop oral thrush, speak to a pharmacist, who can recommend suitable treatment available without a prescription.

Is geographic tongue serious?

No.

Geographic tongue:

• Is not dangerous.

• Does not become cancerous.

• Does not cause permanent damage.

If changes in your tongue are painful, worrying, or not improving, your dental team can check and reassure you.

Key points to remember

• Geographic tongue is common and harmless.

• It is not infectious.

• Symptoms can come and go.

• Simple changes can help reduce discomfort.

If you’re unsure about any changes in your mouth, it’s always okay to ask for advice.