What is it?
Geographic tongue develops when the tiny projections on the top of the tongue, called papillae, are temporarily lost from certain areas. The surface left without papillae looks redder and flatter, and in most cases a slightly raised, whitish or yellowish border runs around it. The pattern formed by the red areas and the intact surface resembles a map, which is where the name comes from.
What sets this apart from other changes on the tongue is that the shapes do not stay put. One area heals over a few days while a new one appears elsewhere on the tongue; a few weeks later the tongue may look completely different. This wandering course helps with the diagnosis. Most people have no symptoms; some describe a mild stinging with sour, spicy or very salty food.
Geographic tongue is not contagious, it is not a fungal infection, and it has not been linked to cancer. It is common, it can appear at any age, and it is often found together with fissured tongue. It is expected to come and go over the years; it is not expected to leave any lasting damage.
Signs
You will not necessarily have all of these at once.
Why does it happen?
- 01
Personal and family predisposition
Some people with geographic tongue have family members with the same appearance. There is no single known cause; it is regarded as an individual difference in the way the lining of the mouth renews itself.
- 02
Appearing alongside fissured tongue
Geographic tongue is reported more often in people who have grooves on the top of the tongue. The two can be present on the same tongue at once; this combination does not mean the condition is more serious.
- 03
Periods that set off a flare-up
The areas are described as spreading after times of heavy stress, hormonal changes and upper respiratory infections. Once the trigger has passed, the appearance usually returns to its previous pattern.
- 04
Foods that make the symptoms worse
Citrus fruits, tomatoes, vinegar, spices and very salty foods can cause a stinging feeling on the surface left without papillae. These are not the cause of the condition; they only make an existing area more sensitive.
How does it progress?
- 1
Appearing
A small, red, flat area appears on one part of the tongue, with a paler border around its edge. Most people feel nothing at this stage.
- 2
Spreading
The area grows over a few days, its border becomes clearer and it joins neighbouring areas to give the map-like appearance. Stinging with spicy and acidic food is described at this stage.
- 3
Healing
As the papillae grow back, the area fades and the surface of the tongue returns to normal. No scar is expected in the same spot.
- 4
Moving on
As one area heals, a new one starts somewhere else on the tongue. This wandering pattern can go on for months; there can also be long spells with no areas at all.
How is it treated?
The diagnosis is made from the appearance and from the wandering course you describe; a biopsy is not needed in most cases. Bearing in mind that a tongue can turn red for other reasons, the dentist assesses thrush, dry mouth, irritation from a denture and signs of a deficiency. If none of these is present, no further treatment is started.
In geographic tongue without symptoms, no benefit has been shown from taking medicines. Antifungal medicines only come into it if thrush is suspected; using them unnecessarily does not change the appearance. During spells of stinging, cutting down on acidic and spicy foods, rinsing with warm water and using an alcohol-free mouthwash are usually enough.
If the symptoms continue, or the discomfort is affecting daily life, your dentist may consider a topical treatment to reduce the pain. What matters most is the habit of keeping an eye on it: an area that does not wander, that stays in one place and does not settle within two to three weeks, does not fit geographic tongue and needs to be assessed separately.
- The area on your tongue is not moving and has stayed in the same place for two to three weeks
- The surface of the area has hardened, become raised or is bleeding
- Burning and pain have become constant, whatever you eat
How is it prevented?
- Cut down on foods that sting during a flare-up; you do not need to make the restriction permanent.
- Clean your tongue gently with a soft brush; hard scraping irritates the surface left without papillae even more.
- Avoid mouthwashes with a high alcohol content and products with strong additives such as peppermint oil.
- Taking a photograph from time to time shows your dentist whether the areas really are moving.
Frequently asked questions
- Is geographic tongue contagious?
- No. Geographic tongue is not an infection; it is not passed on by kissing, by sharing a glass or by any other contact. When it is seen in several members of a family, that comes from a shared predisposition, not from it spreading.
- Can it be a sign of cancer?
- Geographic tongue has not been linked to cancer. The distinguishing point is movement: in geographic tongue the areas heal and then appear somewhere else. A sore or patch that stays in one place, does not heal and becomes hard is not explained by geographic tongue; it needs to be examined.
- Does it clear up completely?
- The areas heal one by one and the surface of the tongue returns to normal; because the predisposition remains, however, the appearance can be expected to come back over the years. These recurrences do not mean that treatment has failed. As long as it causes no symptoms, nothing beyond keeping an eye on it may be needed.
This content is for general information and does not replace an in-person examination. Symptoms overlap between conditions, and a diagnosis can only be made clinically.