Mouth and Lips

Numbness and tingling in the tongue: what causes it, and when is it an emergency?

Rule out a stroke first: sudden numbness with a drooping face or speech problems means calling 112

Numbness or tingling in the tongue usually comes from something harmless: the effect of an injection given for dental treatment, a mild allergic reaction to a raw fruit, a moment of panic, or a migraine aura that passes within a few minutes. But the same feeling can also be the first sign of a stroke, where the blood supply to the brain is cut off. So the first question is not what the cause is, but how the numbness started and what came with it. If it started suddenly and one side of the face has dropped, speech has become slurred or an arm has become weak, call 112 without looking at anything else.

Short answer

If numbness in the tongue started suddenly and one side of the face has dropped, speech has changed or one arm is weak, this may be a sign of a stroke; call 112 immediately, even if the symptoms pass. Other common causes are a dental injection or injury to the tongue's nerve, oral allergy to raw fruit, migraine aura, panic attacks and, in people with diabetes, low blood sugar. Sudden swelling of the tongue, lips or throat also needs 112, even without shortness of breath.

The first thing to check: Is there a drooping face, slurred speech or a weak arm
The emergency number: 112, even if the symptoms have passed
The most typical dental picture: Loss of feeling and taste on one half of the tongue
The cause that needs a blood test: Vitamin B12 or folate deficiency

Medically reviewed by Bilge Ilgın, Dentist · ImplantologyLast reviewed 2026-09-25

How the numbness started tells you its cause

Feeling from the tongue is carried to the brain by nerves that work separately for the right and left halves. Numbness can arise from a problem anywhere along this path: in the tongue itself, in the nerve running under the tongue, or in the part of the brain that processes sensation. The quickest way to work out which is involved is to answer three questions: did it start suddenly, is it on one half of the tongue or all of it, and is there any other symptom with it.

With numbness that starts suddenly, the first thing to consider is a stroke. The FAST acronym used by the NHS sums up the main symptoms of a stroke: the face may have dropped on one side and the person may not be able to smile; they may not be able to lift both arms and keep them there, or have weakness or numbness in one arm; their speech may be slurred or garbled. The last letter stands for time, a reminder to call the emergency number immediately. These can come with weakness or numbness down one side of the body, loss of sight, difficulty finding words and sudden dizziness.

The most dangerous mistake with a stroke is thinking the problem has gone because the symptoms have gone. The NHS says it plainly: stroke symptoms may stop after a short time and you may feel OK; get medical help immediately even if this happens. If you have had any symptoms of a stroke in the past 24 hours, call the emergency number even if they have now gone. Someone who has numbness in the tongue together with a drooping face or slurred speech that settles within a few minutes should not wait but call 112.

Numbness that starts after dental treatment is a separate picture. Anaesthetic given for the lower teeth also numbs half of the tongue, and this lasts a few hours; we have explained its usual duration, and when you should call the clinic, in detail on our page on numbness after a dental injection. If the anaesthetic has worn off but loss of feeling and taste continues on one half of the tongue, the lingual nerve, which carries feeling and taste from half of the tongue, may have been affected. The timetable of this picture, the procedures it is seen after and when to see a specialist are on our dental nerve injury page. The telling point here is this: numbness from dental treatment stays on one half of the tongue, its timing matches a procedure, and it does not cause a drooping face or garbled speech.

Vitamin B12 or folate deficiency brings not so much numbness in the tongue as a sore or red tongue and sometimes mouth ulcers; B12 deficiency can also affect the nervous system, causing numbness, pins and needles, muscle weakness and problems with balance. Tiredness, lack of energy, breathlessness and headaches can come with it. The important side of this picture is time: the NHS stresses that the deficiency should be diagnosed and treated as early as possible, because if treatment is delayed some damage can be permanent. If pins and needles in your hands and feet come with the change in your tongue, see your doctor for a blood test.

If there is itching, tingling or mild swelling of the tongue, lips and palate straight after eating raw fruit, vegetables or nuts, this may be oral allergy syndrome. It is usually seen in people with a pollen allergy, because the proteins in some fruits resemble pollen. Because most of these proteins are broken down by heat, someone who reacts to raw apple can often eat cooked apple without a reaction. The picture is usually not serious and stays confined to the mouth. But if the tongue, lips or throat suddenly swell, or breathing or swallowing becomes difficult, this is a serious allergic reaction and needs 112.

A migraine aura can also cause tingling in the tongue and face. An aura is the set of warning symptoms that come before the headache starts: zigzag lines or flashes of light, numbness or a feeling of pins and needles, dizziness, difficulty speaking. According to the NHS, aura symptoms should not last longer than an hour. The difficulty here is that an aura and a stroke share some symptoms. If there is weakness on one side of the body or face, a problem with speech or loss of sight, do not count it as migraine; call 112. If the aura lasts longer than an hour, or you are experiencing something like this for the first time, ask for an urgent assessment the same day.

There are two causes people think of less often. The first is a panic attack: it can cause numbness and tingling together with a racing heart, a feeling of breathlessness, trembling and a fear of dying; attacks usually last between 5 and 20 minutes. The second is low blood sugar: in people who take insulin or some diabetes medicines, it can come with tingling lips, sweating, trembling, hunger and confusion. If you have diabetes and tingling has started in your lips or tongue, the first thing to do is check your blood sugar.

Which picture can be watched, and which cannot wait

The distinction below is not a firm diagnosis. If any of the items that need a doctor or emergency care applies, act without trying to work it out.

When it fits

In the hours after dental treatmentAnaesthetic numbs half of the tongue for a few hours and wears off gradually the same day. This is an expected picture; take care not to bite your tongue until the numbness has gone.
Straight after raw fruit, confined to the mouthIf the itching and tingling stay in the mouth, there is no marked swelling of the tongue or throat, and breathing and swallowing are not affected, it may be oral allergy. Tell your GP and make a note of the food that triggered it.
A migraine aura you know, lasting less than an hourAn aura you have had in the same way before, which does not last longer than an hour and is followed by your familiar headache, is a familiar picture. If the attacks are becoming more frequent or changing, see your doctor.
At a moment of anxiety, passing within minutesTingling that comes with a racing heart and a feeling of breathlessness and passes within minutes may fit with a panic attack. If it keeps happening, see your GP; if it is the first time, the other causes need ruling out.

When it doesn't

A drooping face, slurred speech or a weak armThis may be a sign of a stroke; numbness that starts suddenly on one side of the body or face is treated the same way. Call 112 immediately, even if the symptoms have passed, and note the time the symptoms started.
If your tongue, lips or throat have suddenly swollenSudden swelling, even on its own, can be a sign of a serious allergic reaction (anaphylaxis); call 112 whether or not there is shortness of breath or difficulty swallowing.
Numbness still there the day after a dental procedureThis means it has gone beyond the time in which the anaesthetic should wear off. Especially if there is loss of feeling and taste on one half of the tongue, call the clinic that did the procedure the same day.
A red, sore tongue and pins and needles in the hands and feetThis suggests vitamin B12 or folate deficiency. Because nerve damage can be permanent if treatment is delayed, see your doctor and ask for a blood test.

What to do, in order, when your tongue goes numb

The sequence below describes the steps to follow the moment you notice the numbness. The first step is ruling out an emergency; looking for the cause comes after that.

1
Stop and check FAST: call 112 if needed
Look in the mirror and smile: has one side of your face dropped? Raise both arms: does one drift down? Say a simple sentence: are the words slurred or garbled? If even one of these applies, call 112 immediately, even if the symptoms pass, and note the time they started. Do not drive yourself to hospital.
2
Check for swelling and your breathing
If there is sudden swelling of the tongue, lips or throat, shortness of breath or difficulty swallowing, call 112. If you have started a new medicine, or it began after eating something, tell the team.
3
If you have diabetes, check your blood sugar
If you take insulin or a diabetes medicine and tingling lips come with sweating, trembling or hunger, check your blood sugar. If it is low, take fast-acting sugar according to the plan your diabetes team has given you.
4
Have you had a dental procedure in the last day
If you have had dental treatment or an extraction, note which side the numbness is on and which part of the tongue, and whether you can taste. If it is still there the next day, call the clinic that did the procedure.
5
Write down the trigger and how long it lasted
What you ate, how long it lasted, whether it was on all of the tongue or half of it, and whether there was a headache, a change in vision or a racing heart with it: these notes make your doctor's job directly easier.
6
If it keeps happening, see your doctor
With numbness that keeps coming back or has no clear cause, your GP listens to your history, examines you and, if needed, requests B12, folate and blood sugar tests. Depending on the cause, you are referred to neurology, an allergy specialist or a dentist.

What is done, depending on the cause

There is no single treatment for numbness in the tongue; what is treated is the cause. The options below do not replace one another.

Emergency treatment if a stroke is suspected

With a stroke, how well treatment works depends on time; so in the first minutes the only thing to do is call 112 and tell the team what time the symptoms started. The hospital team plans the diagnosis and treatment.

Recording and follow-up for numbness from dental treatment

With numbness that goes beyond the usual duration of the anaesthetic, or continues with loss of taste on one half of the tongue, the clinician who did the procedure carries out a baseline examination and repeats it at set intervals. In treatments where several implants are planned, the position of the nerves is established with a CBCT scan before the procedure; if numbness occurs after surgery, the details are on our page on numbness after implants.

Replacement for B12 and folate deficiency

A deficiency confirmed by a blood test is made up with tablets or injections, as your doctor decides. The cause of the deficiency also needs investigating.

Avoiding the trigger in oral allergy

Not eating the fruit or vegetable that causes the reaction raw, and trying it cooked, is enough for most people. If the reaction does not stay confined to the mouth, see an allergy specialist.

Regular follow-up for migraine and panic attacks

With frequently recurring migraine or panic attacks, your GP discusses preventive treatment and support options. If your familiar picture has changed, treat it as a new symptom.

The cost of waiting

Most numbness in the tongue passes without harm. What carries a heavy cost is taking an emergency cause for a harmless one.

Ignoring a stroke symptom that has passed

A drooping face or slurred speech that settles within a few minutes may be a transient ischaemic attack (TIA), and it points to a high risk of stroke. The NHS says that if you have had symptoms of a stroke in the past 24 hours, you should call the emergency number even if they have now gone.

Underestimating allergic swelling

A mild reaction confined to the mouth and a serious reaction that tightens the throat can start with the same food. The moment breathing or swallowing is affected, there is no more time for waiting.

Noticing B12 deficiency late

If a deficiency affecting the nervous system is left untreated for a long time, some damage can be permanent. Symptoms in the mouth and tongue are among the clues that bring this picture to light early.

Losing time when a nerve has been affected by dental treatment

With lingual nerve injury, the timetable matters; if no improvement is seen within three months, a specialist assessment is recommended. Delaying reporting it narrows this window.

Biting or burning a numb tongue

When a numb tongue is bitten or comes into contact with a hot drink, you do not notice the pain. While the numbness lasts, avoid hot drinks and careless chewing.

How long the numbness lasts

The duration depends entirely on the cause. The framework below shows which duration fits which cause.

Minutes
Tingling from a panic attack usually passes within 5 to 20 minutes. Oral allergy also usually fades shortly after the food is swallowed.
Up to an hour
A migraine aura should not last longer than an hour. An aura that lasts longer, or a picture that comes with weakness and speech problems, needs urgent assessment.
Hours
The effect of dental anaesthetic on the tongue lasts a few hours and wears off gradually the same day.
Weeks and months
Pictures in which the lingual nerve has been affected, and nerve symptoms caused by B12 deficiency, can recede with treatment over weeks or months. This process needs regular follow-up.

Don't wait if

A drooping face, slurred speech or a weak arm. Call 112 immediately, even if the symptoms have passed.
Sudden swelling of the tongue, lips or throat, or shortness of breath. It may be a serious allergic reaction; call 112.
The aura has lasted longer than an hour, or it is the first time. If you are not sure it is migraine, ask for an urgent assessment.
Numbness still there the day after a dental procedure. Call the clinic that did the procedure the same day; if there is loss of taste on one half of the tongue, mention it specifically.
Numbness that keeps coming back with no clear cause. See your GP; B12, folate and blood sugar tests may be requested.

What determines the scope

Depending on the cause, numbness in the tongue is assessed in different places, from A&E to the dentist. These are the items that determine the scope:

Whether an emergency assessment is needed: If a stroke or a serious allergy is suspected, assessment and treatment happen in hospital, and that is an entirely different scope.
Blood tests: B12, folate and blood sugar tests fall within the remit of your GP or doctor.
Follow-up of a nerve affected by dental treatment: Sensory examination, follow-up appointments and, if needed, reviewing the imaging fall within the remit of the clinician who did the procedure.
Specialist referral: If referral to neurology, an allergy specialist or oral and maxillofacial surgery is needed, it is a separate process.

Frequently asked questions

What is numbness in the tongue a sign of?

The commonest causes are anaesthetic from dental treatment, injury to the lingual nerve, vitamin B12 or folate deficiency, oral allergy to raw fruit, migraine aura, panic attacks and, in people with diabetes, low blood sugar. Numbness that starts suddenly and comes with a drooping face, slurred speech or a weak arm, on the other hand, may be a sign of a stroke and needs 112.

Can numbness in the tongue be a sign of a stroke?

It can, especially if it started suddenly and comes with one side of the face dropping, slurred speech or weakness in one arm. In that case, call 112 immediately, even if the symptoms pass. Numbness that starts suddenly down one side of the body can also be a sign of a stroke on its own; if you are not sure, call 112 without waiting.

What causes tingling in the tongue?

Tingling usually shows that the way a nerve carries signals has changed for a while. It is common as dental anaesthetic wears off, with a migraine aura, in a panic attack, when blood sugar drops and with oral allergy. With B12 deficiency, pins and needles are felt more in the hands and feet, and can come with redness and soreness of the tongue.

My tongue is numb after a tooth extraction. Is that normal?

In the few hours after the procedure, yes; the anaesthetic numbs half of the tongue. Numbness that is still there the next day, or continues with loss of taste on one half of the tongue, suggests the lingual nerve has been affected, and should be reported to the clinic that did the procedure the same day.

Can B12 deficiency cause numbness in the tongue?

Vitamin B12 or folate deficiency mostly causes a sore, red tongue and sometimes mouth ulcers; B12 deficiency can also affect the nervous system and cause numbness and pins and needles. The diagnosis is made with a blood test. Because some damage can be permanent if treatment is delayed, see your doctor early.

My tongue tingles after eating fruit. Is it an allergy?

If your mouth itches and tingles straight after eating raw fruit, vegetables or nuts, it may be oral allergy syndrome. It is usually seen in people with a pollen allergy and is often not serious; the cooked form may not cause a reaction. If your tongue or throat is swelling or breathing is becoming difficult, call 112.

Can migraine cause numbness in the tongue?

Yes, a migraine aura can cause numbness and a feeling of pins and needles. According to the NHS, aura symptoms should not last longer than an hour. If it is the first time, it has lasted longer than an hour, or there is weakness on one side of the body, do not count it as migraine; ask for an urgent assessment.

Can stress or a panic attack cause numbness in the tongue?

It can. In a panic attack, numbness and tingling can be felt together with a racing heart, a feeling of breathlessness and trembling; attacks usually last between 5 and 20 minutes. But if it is the first time, the other causes need ruling out; do not dismiss it as stress on your own.

Which doctor should I see?

If it started suddenly, or there is a drooping face, slurred speech or swelling, 112. For numbness that continues after a dental procedure, the dentist who did the procedure. For numbness that keeps coming back or has no clear cause, your GP; if needed, they will refer you to neurology or an allergy specialist.

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