Why is my tongue swollen, and when is it an emergency?
Written by Adèle & Dvir · 6 sources cited · Updated October 19, 2026
Quick answer
A tongue that swells suddenly, over minutes to hours, is a medical emergency until proven otherwise, because it can be anaphylaxis or angioedema and can block the airway: call 911, especially if breathing, swallowing or speaking is affected. Slower or milder tongue swelling is usually from injury, a burn, infection or inflammation, and long-term enlargement can come from conditions such as an underactive thyroid. Blood pressure medicines called ACE inhibitors are a well-known cause of sudden swelling, even after years of use.
On this page
Call 911 now if
The NHS advises calling emergency services for any of these:
- Sudden swelling of the lips, mouth, throat or tongue
- Difficulty breathing, very fast breathing, wheezing or noisy breathing
- A tight throat, hoarse voice or difficulty swallowing
- Blue, gray or pale skin, lips or tongue
- Sudden confusion, drowsiness, dizziness or fainting
If the person has an epinephrine auto-injector (such as an EpiPen) and signs of anaphylaxis, use it and call 911. The NHS advises lying down with the legs raised, or sitting up slowly if breathing is hard, not standing or walking even if feeling better, and using a second auto-injector if there is no improvement after 5 minutes. Do not drive yourself to the hospital.
Sudden causes: allergy and angioedema
Angioedema is rapid swelling deep in the skin and lining tissues, and the tongue and lips are common sites. The NHS and Cleveland Clinic describe several types:
| Type | Trigger | Typical features |
|---|---|---|
| Allergic | Foods (nuts, shellfish, eggs, milk), insect stings, medicines, latex | Starts within minutes to a couple of hours, often with hives or itching; can be part of anaphylaxis |
| Medicine-related (non-allergic) | Most commonly ACE inhibitors for blood pressure | Usually no hives; can start weeks, months or longer after starting the medicine |
| Hereditary | Inherited deficiency of a protein called C1 inhibitor | Repeated unpredictable swelling, often without hives; NHS calls it rare and potentially life-threatening |
| Acquired | Linked to some lymphomas or autoimmune conditions | Very rare |
| Idiopathic | No cause found | Recurrent swelling |
Cleveland Clinic notes angioedema usually lasts a few hours to a couple of days. Swelling without hives is important to mention, because it may not respond to the same treatment as allergic swelling.
Gradual or milder causes
- Injury: biting, burns from hot food or drink, dental work and new tongue piercings cause local swelling that usually settles within days.
- Glossitis: inflammation from infection, irritants, dry mouth or vitamin deficiencies can make the tongue swollen, red and sore. See glossitis.
- Infections: including strep throat and scarlet fever, which can cause a red, swollen strawberry tongue, and deeper infections of the mouth or floor of the mouth.
- Underactive thyroid, acromegaly and amyloidosis: cause slow, long-term enlargement rather than sudden swelling. See macroglossia.
- Other conditions: MedlinePlus also lists Down syndrome, leukemia and, rarely, tongue cancer among causes of an enlarged or swollen tongue.
Mild swelling often shows up as tooth marks along the edges before you notice the size change.
How to tell how urgent it is
| Situation | Action |
|---|---|
| Rapid swelling, any breathing, swallowing or voice change | Call 911 |
| Rapid swelling of the tongue or lips without breathing problems | Emergency care now; it can progress |
| Swelling with fever, severe pain or swelling under the chin | Same-day medical care |
| Swelling after a bite or burn that is improving | Home care, review if not better in a few days |
| Slow enlargement over months | Book a doctor's appointment |
Treatment
Treatment depends on the cause. Allergic swelling and anaphylaxis are treated with epinephrine, antihistamines and steroids. Medicine-related angioedema means stopping the drug under medical supervision and switching to another; do not stop a blood pressure medicine on your own, but do seek urgent care for any swelling while taking an ACE inhibitor. Hereditary angioedema is managed by specialists with medicines that prevent or treat attacks. Infections are treated with the right antimicrobial, and long-term enlargement by treating the underlying condition.
Home care for mild swelling after injury
- Suck ice chips or sip cold water to reduce swelling and pain.
- Rinse gently with salt water to keep the area clean.
- Avoid hot, spicy, acidic and crunchy food until it settles.
- Do not scrape or brush a swollen tongue; wait until the swelling has gone down.
- Watch for any spread of swelling or breathing changes, and get help immediately if they happen.
When to see a dentist or doctor
- Sudden swelling of the tongue, lips or throat - call 911
- Any difficulty breathing, swallowing, speaking or a hoarse voice with tongue swelling - call 911
- Tongue swelling while taking an ACE inhibitor blood pressure medicine, even after years on it
- Swelling with fever, severe pain, drooling or swelling under the jaw
- Repeated episodes of swelling without hives, or a family history of swelling attacks
This guide is general information, not a diagnosis. If you are worried about a symptom, see a dentist or doctor.
Frequently asked questions
Related guides
Sources
- Angioedema (NHS)
- Anaphylaxis (NHS)
- Angioedema (Cleveland Clinic)
- Angioedema (MedlinePlus)
- Tongue problems (MedlinePlus)
- Recurrence of unilateral angioedema of the tongue: A case report (NIH / PMC)