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Tongue Problems: Common Changes and What They May Mean

Most changes to the tongue, such as a white coating, a dark furry look or map-like red patches, are harmless. Here is what the common ones may mean, what helps, and which changes need checking.

Updated September 2026·By the OHA editorial team·8 min read·How we write
Key takeaways
  • The NHS says a sore or white tongue is not usually serious and is often easily treated. Gently brushing your tongue can help a white coating.
  • A dark, furry-looking tongue (black hairy tongue) and red, map-like patches (geographic tongue) can look alarming but are usually harmless.
  • A burning tongue that looks normal may be burning mouth syndrome. A dentist or doctor can look for causes such as a dry mouth or low iron or vitamin levels.
  • Get a white or red patch, a lump, or an ulcer that does not heal checked by a dentist or GP. Most have another cause, but they can be an early sign of mouth cancer.
  • Sudden swelling of the tongue, lips or throat, especially with difficulty breathing or swallowing, is an emergency.

The surface of your tongue is covered in tiny rounded bumps called papillae, which contain your taste buds (Mayo Clinic). Its colour and surface can change for many reasons. The NHS says a sore or white tongue is not usually serious, but advises against diagnosing yourself: see a GP or dentist if you are worried. For babies whose tongue movement is restricted, see tongue-tie.

A white tongue or white patches

The NHS lists several possible causes of a white tongue:

  • Oral thrush, a fungal infection that can cause an itchy, red mouth with white patches. The NHS says it is more common in babies and older people with dentures. See oral thrush.
  • Leukoplakia, white patches that cannot be rubbed or scraped away, often on or below the tongue. The NHS says there is a small chance they could progress to mouth cancer over time, which is why they should be checked.
  • Lichen planus, which can cause white patches on the gums, tongue or inside of the cheeks, with burning or stinging when you eat or drink. The NHS says it can last several years in the mouth, a GP can prescribe mouthwashes and sprays to ease it, and it is not catching. See oral lichen planus and white and red patches in the mouth.
  • Geographic tongue, mouth ulcers, anaemia and scarlet fever.

A different type, hairy leukoplakia, causes fuzzy, ridged white patches, often on the sides of the tongue, in people with a weakened immune system. The NHS says it is caused by a virus and does not carry a risk of mouth cancer.

What helps a white or sore tongue

The NHS suggests using a soft toothbrush, brushing your tongue or using a tongue scraper to improve a white tongue, drinking cool drinks through a straw, and taking paracetamol or ibuprofen if it is sore (see toothache for cautions). Avoid toothpaste containing sodium lauryl sulphate (SLS), spicy, acidic or hot food and drink, smoking and alcohol. A pharmacist can advise and tell you whether to see a dentist or GP.

A black or furry-looking tongue

Black hairy tongue gives the tongue a dark, furry look. Mayo Clinic explains that the papillae grow longer than usual because they do not shed dead skin cells, then trap and are stained by food, drinks, tobacco, bacteria or yeast. The colour may also be brown, green, yellow or white. It can cause a metallic taste, bad breath or a tickling, gagging feeling, but Mayo Clinic says it is usually painless and harmless.

Possible causes include antibiotics, not cleaning the mouth and tongue well, a dry mouth, a soft diet, mouthwashes containing peroxide, tobacco, a lot of coffee, black tea or alcohol, certain medicines and a weakened immune system (Mayo Clinic). It usually clears once the cause is dealt with. Mayo Clinic suggests gently brushing your tongue whenever you brush your teeth, brushing twice a day with fluoride toothpaste, cleaning between your teeth daily and drinking plenty of water. Do not stop a prescribed medicine without talking to your doctor first.

Red, map-like patches (geographic tongue)

The Oral Health Foundation describes geographic tongue as common and harmless: smooth red patches with pale or white edges on the top or sides of the tongue, shaped like a map. The Australian Dental Association says the red areas are where the papillae have been lost, the patches can move and come and go over months or years, and it affects 1 to 3% of people. Its cause is not known. The Oral Health Foundation says it can run in families, is not an infection and cannot be passed on, and both bodies say it does not cause cancer.

Many people have no symptoms. Some notice soreness or burning, especially with acidic, spicy or very salty foods. Most people need no treatment beyond avoiding foods that make it sore and brushing gently (Oral Health Foundation). If treatment is needed, the Australian Dental Association says a health professional can provide steroid mouthwashes or numbing creams. It advises having the diagnosis confirmed by a dentist, because other conditions, including oral cancer, can cause red patches.

A sore or burning tongue

The NHS says biting or burning your tongue on hot food or drink can cause pain and swelling that should only last a few days. Mouth ulcers can appear on the tongue and usually clear up within a week or two (NHS). Lichen planus, geographic tongue and thrush can also make the tongue sore.

Burning mouth syndrome

Burning mouth syndrome causes a burning, scalding or tingling feeling even though the mouth looks normal. The Oral Health Foundation describes it as nerve-related (neuropathic) pain. The US National Institute of Dental and Craniofacial Research (NIDCR) says it is most common on the tip, sides and top of the tongue, can happen daily for months or longer, often builds through the day, and may ease for a while when you eat or drink. Both bodies say it is more common in women, especially around or after the menopause. Our guide to menopause and oral health covers the possible link with menopause.

A dentist or doctor will first look for other causes of a burning mouth. The NIDCR and the Oral Health Foundation list a dry mouth, thrush, acid reflux, low iron or B vitamins, diabetes, thyroid problems, reactions to dental products, some medicines, and anxiety, depression or stress. Treatment depends on the cause; the NIDCR says some medicines used for anxiety, depression and nerve conditions can also help. To ease symptoms, both suggest sipping cold water, sucking ice chips, chewing sugar-free gum, and avoiding spicy or acidic food, tobacco, alcohol and alcohol-based mouthwashes. It can last months or years, so speak to your doctor if it is affecting your mood (Oral Health Foundation).

A swollen tongue

The NHS says angioedema, sudden swelling often caused by an allergic reaction (and sometimes by a medicine), commonly affects the lips, tongue and eyelids, and swelling of the throat can affect breathing. healthdirect Australia lists a swollen tongue among the signs of anaphylaxis, a severe allergic reaction. See the emergency box below.

Patches, lumps and ulcers that need checking

The Australian Dental Association says mouth cancer most commonly occurs on the sides of the tongue and the floor of the mouth, and often causes no symptoms at first. Signs include an ulcer that does not heal, a red or white patch, a lump, pain, or numbness or difficulty moving the tongue (NHS, Australian Dental Association, NIDCR). The NHS says these symptoms are very common and can be caused by other conditions, but finding cancer early may make it easier to treat.

How long to wait before getting an ulcer checked differs by country: more than 3 weeks in NHS advice, and more than 2 weeks for the Australian Dental Association and the NIDCR. The NHS attaches no waiting time to a lump or a red or white patch. See mouth cancer.

Tongue-tie

In tongue-tie, the NHS says the skin joining the tongue to the floor of the mouth is shorter or tighter than usual. It is most common in babies and is only treated if it causes problems, such as difficulty feeding. Speak to a midwife, health visitor or GP if you are concerned.

When to see a dentist, GP or pharmacist
  • Tongue pain or itchiness does not go away or gets worse, or you have white patches on your tongue (NHS).
  • An ulcer has lasted more than 3 weeks (NHS) or 2 weeks (Australian Dental Association, NIDCR), or you have a red patch, a lump or numbness.
  • A black, furry tongue does not clear even though you brush your teeth and tongue twice a day (Mayo Clinic).
  • Your mouth or tongue keeps burning: start with your dental team (Oral Health Foundation).
Get help urgently
  • UK: the NHS says call 999 if your lips, mouth, throat or tongue suddenly swell, you are struggling to breathe or swallow, your throat feels tight, or your skin, tongue or lips turn blue, grey or pale. Do not drive yourself to A&E.
  • Australia: for suspected anaphylaxis, healthdirect says use an adrenaline autoinjector if one is available, then call triple zero (000). After a mouth injury, call 000 or go to the emergency department if the mouth or tongue is very swollen or there is trouble breathing, talking or swallowing.

Frequently asked questions

Is geographic tongue contagious or cancerous?

No. The Oral Health Foundation says it is not an infection and cannot be passed on, and both it and the Australian Dental Association say it does not cause cancer.

Should I brush or scrape my tongue?

The NHS suggests it for a white tongue and Mayo Clinic for black hairy tongue. Be gentle. Health bodies disagree on whether it helps bad breath: see bad breath.

Why does my tongue burn when it looks normal?

It may be burning mouth syndrome, which the Oral Health Foundation describes as nerve-related pain. A dentist or doctor can check for other causes first, such as a dry mouth, thrush or low vitamin levels.

Sources

  1. Sore or white tongue, NHS, accessed September 2026
  2. Leukoplakia, NHS, accessed September 2026
  3. Lichen planus, NHS, accessed September 2026
  4. Mouth ulcers, NHS, accessed September 2026
  5. Symptoms of mouth cancer, NHS, accessed September 2026
  6. Angioedema, NHS, accessed September 2026
  7. Tongue-tie, NHS, accessed September 2026
  8. Geographic tongue, Oral Health Foundation, accessed September 2026
  9. Burning mouth syndrome, Oral Health Foundation, accessed September 2026
  10. What are these red patches on my tongue?, Australian Dental Association, accessed September 2026
  11. Oral cancer, Australian Dental Association, accessed September 2026
  12. Anaphylaxis, healthdirect Australia, accessed September 2026
  13. Dental injury, healthdirect Australia, accessed September 2026
  14. Burning mouth syndrome, NIH National Institute of Dental and Craniofacial Research, accessed September 2026
  15. Oral cancer, NIH National Institute of Dental and Craniofacial Research, accessed September 2026
  16. Black hairy tongue: symptoms and causes, Mayo Clinic, accessed September 2026
  17. Black hairy tongue: diagnosis and treatment, Mayo Clinic, accessed September 2026

This article is general information about oral health. It is not a diagnosis or a substitute for advice from a dentist or doctor who knows your situation. If you have pain, swelling, bleeding that does not settle, or a problem that is getting worse, see a dental professional. In an emergency, contact your local emergency service.

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