Why Is My Tongue Swollen? Causes, Emergencies, and Treatment

Why Is My Tongue Swollen?

A swollen tongue can be an emergency or a chronic symptom. Sudden swelling — especially with trouble breathing, hives, or facial swelling — could be anaphylaxis or angioedema and needs 911 care.^1,2 Slower or persistent swelling is usually glossitis, macroglossia, or an infection, and the cause guides the treatment.^3,4

Call 911 or go to the ER right now if you have:

• Trouble breathing, throat tightness, or stridor (a high-pitched sound when you breathe in)
• Rapid swelling of the tongue, lips, face, or throat
• Hives along with dizziness, vomiting, or a racing heartbeat
• Trouble swallowing your own saliva or a muffled voice
• Bluish lips or fingertips

If you have an epinephrine auto-injector for a known allergy, use it now and then call 911 — antihistamines and steroids are not a substitute.¹

According to Dr. Nandita Lilly, NewMouth’s in-house resident dentist, “When a tongue swells fast and the airway feels tight, treat it as an emergency first. Epinephrine works in minutes, and the ER can watch the airway while it does.”

When to Call 911 or Go to the ER

Any sudden, rapidly progressing tongue swelling is a medical emergency until proven otherwise. Anaphylaxis can close the airway within minutes, and intramuscular epinephrine is the first-line treatment.¹ Angioedema involving the tongue or throat also needs emergency airway monitoring. If the cause is an ACE inhibitor or hereditary angioedema, epinephrine may not work, and the ER will reach for other options.^7,8

Call 911 immediately for:

• Trouble breathing, wheezing, or stridor
• Tongue, lip, or throat swelling that worsens by the minute
• Hives or flushing combined with vomiting, dizziness, or low blood pressure
• A muffled or hoarse voice, drooling, or trouble swallowing saliva
• Any tongue swelling while you’re taking a medication linked to angioedema — especially an ACE inhibitor, whether you just started it or have been on it for years⁵

While you wait for help, sit upright if breathing is hard, loosen tight clothing around the neck, and avoid eating or drinking. If you carry epinephrine, inject it into the outer thigh and lie down with your legs raised unless you’re vomiting or struggling to breathe.¹

The Three Main Types of Tongue Swelling

Doctors group tongue swelling into three clinical categories. Knowing which one fits your symptoms tells you how urgent it is and what to do next.⁴

Angioedema

Angioedema (ang-ee-oh-eh-DEE-mah) is rapid, deep-tissue swelling of the lips, tongue, face, or airway.⁶ It develops within minutes to a few hours and feels firm or tense rather than itchy. Angioedema has four main types:

• Allergic angioedema — triggered by food, insect stings, latex, or medications and usually paired with hives
• Drug-induced (non-allergic) angioedema — usually caused by ACE inhibitors; appears weeks, months, or years after starting the drug^5,7
• Hereditary angioedema (HAE) — a rare genetic condition in which C1-inhibitor protein is either too low or doesn’t work properly; it is not an allergy, has no hives, and does not respond to epinephrine alone⁸
• Idiopathic angioedema — no identifiable trigger

Any angioedema involving the tongue or throat is an airway emergency.

Glossitis

Glossitis is visible inflammation of the tongue that makes it look red, smooth, or swollen.³ It develops over days to weeks and is usually painful but not airway-threatening. Common causes include nutritional deficiencies (B12, folate, iron), infections, irritants, and autoimmune disease.

See our glossitis article for the full list of causes, treatments, and home-care steps — that page is the cluster’s deep dive on inflammation-driven swelling.

Macroglossia

Macroglossia means the tongue is genuinely larger than normal.⁹ It can be congenital (present from birth) or acquired later in life. Causes include:

• Hypothyroidism, especially advanced or untreated^10,11
• Amyloidosis (abnormal protein buildup in tissues)
• Acromegaly (excess growth hormone in adults)
• Down syndrome
• Beckwith-Wiedemann syndrome (a growth disorder in infants)

Macroglossia develops slowly and is usually a clue to an underlying condition rather than a problem with the tongue itself. Treatment focuses on the root cause.

Allergic Reactions and Anaphylaxis

An allergic reaction is one of the most common causes of sudden tongue swelling.^1,6 The swelling usually appears within minutes of exposure, paired with hives, itching, or facial puffiness. Severity ranges from mild oral itching to life-threatening anaphylaxis.

The FDA recognizes nine major food allergens that account for the majority of severe food reactions: milk, eggs, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans, and sesame.¹²

Other common allergic triggers include:

• Latex
• Insect bites and bee stings
• Medications, especially penicillin-class antibiotics and NSAIDs
• Toothpaste or oral-care ingredients — usually flavoring agents or preservatives¹³

If raw apple, peach, or carrot makes your tongue itch or feel mildly swollen within minutes, you may have oral allergy syndrome. The reaction is usually limited to the mouth, but throat tightness, trouble swallowing, or any breathing symptoms turn it into an emergency — call 911. See our itchy tongue article for the full pattern.

Anaphylaxis is the most severe form of allergic reaction. Signs beyond tongue and lip swelling include trouble breathing, hives across the body, vomiting, a fast heartbeat, and dizziness or fainting. Epinephrine is the only proven first-line treatment — antihistamines, steroids, oxygen, and IV fluids are supportive, not equivalent.¹ Use your auto-injector if you have one, then call 911.

After the ER stabilizes you, see an allergist to identify the trigger. The long-term plan usually includes a refilled auto-injector and a written emergency action plan.

Medication-Induced Tongue Swelling

Medications cause tongue swelling through a process called angioedema, and ACE inhibitors are the leading culprit.^5,7 Blood-pressure drugs in the ACE-inhibitor class — lisinopril, enalapril, ramipril, and others (the names end in “-pril”) — account for roughly 20% to 40% of angioedema cases treated in emergency departments.⁵ The reaction is not allergic; the drug interferes with the enzyme that normally breaks down bradykinin, so bradykinin builds up and triggers swelling.⁷

ACE-inhibitor angioedema has two features that catch patients off guard:

• It can appear at any time after starting the drug — sometimes within hours, sometimes after years of uneventful use⁵
• It’s not an allergic reaction, so it doesn’t come with hives and won’t always respond fully to epinephrine, antihistamines, or steroids⁷

Other medication classes linked to angioedema include:

• Angiotensin receptor blockers (ARBs) — losartan, valsartan, and similar drugs; lower risk than ACE inhibitors but not zero
• Sacubitril-valsartan — a combination heart-failure drug; risk is higher in people switched directly from an ACE inhibitor or ARB¹⁴
• DPP-4 inhibitors — diabetes drugs like sitagliptin
• NSAIDs — ibuprofen, naproxen, and aspirin
• Antibiotics — penicillins and sulfa drugs cause classic allergic angioedema rather than the ACE-inhibitor type

Any tongue swelling that shows up while you’re taking, starting, or switching one of these medications needs same-day evaluation. If breathing is affected, call 911. Stopping the drug usually stops the recurrences, but only your prescribing doctor should change a heart or blood-pressure medication.⁷

Infections That Cause Tongue Swelling

Mouth and throat infections swell, inflame, or coat the tongue. The most common culprits are oral thrush, herpes simplex, and bacterial infections in nearby tissues. The pattern of symptoms — white patches, blisters, fever, one-sided pain — points to the cause.

• Oral thrush is a yeast infection that causes white patches, redness, and soreness on the tongue and inner cheeks.¹⁵ It’s most common in infants, denture wearers, people on inhaled steroids, and anyone with a weakened immune system. See oral thrush for treatment options.
• Herpes simplex virus (HSV) causes painful blisters on the tongue, lips, or gums, sometimes with low-grade fever during the first outbreak.
• Strep throat causes throat and tonsil swelling and painful swallowing. When group A strep causes scarlet fever, the tongue can turn red and bumpy — the classic “strawberry tongue” pattern.¹⁶
• Syphilis can cause painless oral sores or mucous patches in the early stages. Gonorrhea can infect the throat and often causes no symptoms, though it may cause sore throat.
• Dental abscess or salivary-gland infection produces one-sided tongue swelling, pain at the floor of the mouth, and fever.

Ludwig angina is an uncommon but dangerous deep-neck infection — usually from a lower molar — that swells the floor of the mouth and pushes the tongue upward.¹⁷ It can block the airway and needs ER care.

Swelling that’s mostly on one side or at the back of the tongue is usually local — an infected tooth, a bump on the back, or trauma. See our articles on bumps on the back of the tongue and tip-of-tongue pain for the location-specific patterns.

Underlying Medical Conditions

Some systemic conditions show up in the tongue before they show up anywhere else. These causes develop slowly, rarely threaten the airway, and usually need treatment of the root condition rather than the tongue itself.

• Hypothyroidism, often caused by Hashimoto’s disease — an underactive thyroid can enlarge the tongue along with fatigue, weight gain, cold intolerance, and constipation.¹¹ Treatment is daily thyroid hormone replacement.
• Vitamin and mineral deficiencies — low B12, folate, B2, B3, B6, or iron leads to atrophic glossitis, where the tongue looks smooth, red, and feels sore.¹⁸ Supplementation and dietary changes typically reverse the appearance within weeks.
• Sjögren’s syndrome — an autoimmune disease that attacks the salivary glands. The resulting dry mouth leaves the tongue fissured, sore, or vulnerable to candida infection rather than directly swollen.¹⁹
• Other autoimmune and skin conditions — pemphigus vulgaris, oral lichen planus, and psoriasis have been associated with tongue inflammation, ulcers, or fissures.²⁰ See glossitis for the full list.
• Melkersson-Rosenthal syndrome — a rare neurological condition that causes recurrent facial paralysis, fissured tongue, and lip or tongue swelling.

If your tongue has been swollen for weeks without an obvious cause, ask your dentist or doctor for blood work to screen for thyroid disease and nutritional deficiencies.

Trauma and Irritation

Most trauma-related tongue swelling resolves within 10 days.³ The tongue heals quickly because it has rich blood supply, but the first day or two can be sore.

Common causes include:

• Biting the tongue while chewing or during sleep
• Burning the tongue on hot food or drink
• Oral piercings, especially in the first two weeks
• Sharp edges on a dental restoration, denture, or orthodontic appliance
• Chronic irritation from alcohol, tobacco, very spicy foods, or acid reflux (GERD)

Stick to soft, cool foods, avoid acidic drinks, and rinse with warm salt water several times a day until the swelling resolves. See a dentist if a sharp edge keeps re-injuring the same spot or if the swelling lasts beyond 10 days.

Tongue Cancer

A swelling, lump, or non-healing sore on the tongue that lasts more than 2 weeks should be evaluated by a dentist or doctor.^21,22 Tongue cancer is rare, but early diagnosis dramatically improves treatment outcomes.

Warning signs include:

• A lump, thickening, or rough patch that doesn’t go away
• A persistent red or white patch
• Pain, numbness, or difficulty moving the tongue
• Trouble chewing, swallowing, or speaking
• Unexplained bleeding

Risk factors include tobacco use, heavy alcohol use, HPV infection, and a family history of oral cancer. For a deeper look at symptoms and screening, see our oral cancer article.

How Doctors Diagnose a Swollen Tongue

Diagnosis starts with an airway check and a history. Your provider will look at your tongue, mouth, and throat, then ask about timing, triggers, medications, and any other symptoms.

Common diagnostic steps include:

• A physical exam of the tongue, mouth, lymph nodes, and salivary glands
• A medication review — especially blood-pressure, diabetes, and pain medications
• Blood tests for thyroid function, B12, folate, iron, complete blood count, and — if HAE is suspected — C4 plus C1-inhibitor level and function
• Allergy testing if a food, drug, or environmental trigger is suspected
• Imaging or a biopsy if a mass, abscess, or suspected cancer is found

Tell your provider where the swelling is. Location narrows the differential:

• Swelling at the tip or edges of the tongue → see tip-of-tongue pain
• Bumps or swelling at the back of the tongue → see bumps on the back of the tongue
• Under the tongue or one-sided swelling that’s growing → infection or salivary-gland involvement; treat as a priority evaluation

Treatment Options

Treatment depends on the cause, but most cases follow one of three tracks: emergency airway management, allergy or medication management, or treatment of the underlying condition.

Emergency Treatment

For anaphylaxis or mast-cell-driven (allergic) angioedema with airway involvement, ER treatment includes:

• Intramuscular epinephrine — the first-line drug¹
• Oxygen and airway monitoring; intubation if the airway is at risk
• IV fluids for low blood pressure
• Antihistamines and corticosteroids as supportive therapy, not as substitutes for epinephrine

For angioedema caused by an ACE inhibitor or hereditary angioedema, the ER’s first priority is protecting the airway — intubation if needed. Epinephrine often won’t work for these types. ACE-inhibitor angioedema usually resolves on its own once the drug is stopped. Hereditary angioedema has its own targeted treatments (C1-inhibitor concentrates, icatibant, ecallantide) that the ER will use if HAE is known or suspected.^7,8

Treating the Underlying Cause

Once the airway is safe, treatment shifts to the root cause:

• Allergies — avoid known triggers, carry an epinephrine auto-injector, see an allergist for a long-term plan
• ACE-inhibitor angioedema — your doctor will stop the drug and switch to a different class of blood-pressure medication
• Infections — antifungals for thrush, antivirals for herpes, antibiotics for bacterial infections
• Hypothyroidism — daily thyroid hormone replacement
• Vitamin deficiencies — supplements and dietary changes; B12 deficiency sometimes requires injections
• Tongue cancer — surgery, radiation, chemotherapy, or a combination, depending on stage

Home Care for Mild Swelling

For minor swelling from a bite, burn, or food irritation:

• Practice good oral hygiene — Brush and floss daily and use an alcohol-free, non-irritating mouthwash.
• Drink plenty of fluids — Cool water and ice chips ease pain and reduce dry mouth.
• Avoid irritating foods — Skip acidic, salty, or spicy foods until the swelling resolves.

If swelling lasts more than 10 days, worsens, or is paired with any red-flag symptoms above, see a doctor.

When to See a Dentist or Doctor

Call 911 for any tongue swelling that affects breathing, swallowing, or speech. Otherwise, use these thresholds:

• Same day — sudden swelling without trouble breathing, swelling that shows up while you’re on a medication linked to angioedema (whether you just started it or have been on it for years), swelling with fever or a visible infection, one-sided swelling with pain or pus
• Within a week — swelling that’s lasted more than 10 days after a known bite or burn, white patches that won’t wipe off, a sore or lump that hasn’t improved
• Schedule an exam — chronic mild swelling without a clear cause, a tongue that looks larger or feels heavier than usual over weeks to months, recurrent swelling without hives (possible HAE), or any tongue change you’d want a dentist to look at during your next visit

Bring a list of every medication you take — including over-the-counter drugs and supplements — to any appointment for unexplained tongue swelling. Drug reactions are easier to spot when the full list is in front of the clinician.