Throat Swelling: Causes, Symptoms and When to Get Help

What throat swelling feels like

Throat swelling can mean several different things, and the feeling often points to the cause:

• Swollen, painful tonsils or back of the throat: pain on swallowing, red tissue and sometimes white patches. This is typical of infection.
• Tightness or closing sensation: a feeling that the throat is narrowing, with a change in voice or noisy breathing. This is typical of allergic swelling and is the most dangerous kind.
• Swelling outside the throat: tender lumps under the jaw or along the neck, which are usually swollen lymph nodes reacting to an infection.
• A lump sensation without pain: the feeling of something stuck in the throat, often with nothing visibly swollen. This is called globus and is common with reflux and stress.

The throat has two narrow points where swelling matters most: the pharynx (behind the mouth and nose) and the larynx (voice box). Swelling of the larynx or the epiglottis, the flap that covers the windpipe when you swallow, can narrow the airway quickly. That is why a change in voice or breathing is more worrying than pain alone. Our page on swollen throat as a condition explains these types of swelling and their treatment in more detail.

Common causes of throat swelling

Viral sore throat

Most sore, swollen throats come from cold and flu viruses. The throat looks red and puffy, and symptoms usually include a runny nose, cough and mild fever. It improves within 5 to 7 days without antibiotics.

Tonsillitis and strep throat

Tonsillitis is infection of the tonsils, which become large, red and sometimes coated with white or yellow spots. Viruses cause most cases. Strep throat, caused by group A Streptococcus bacteria, typically brings sudden throat pain, fever, swollen tender neck glands and no cough. It is diagnosed with a rapid swab test and treated with antibiotics.

Infectious mononucleosis

Mono, caused by the Epstein-Barr virus, can make the tonsils so large they nearly touch. Teenagers and young adults get it most often. Clues are marked tiredness, swollen glands at the back of the neck, and illness lasting 2 to 4 weeks.

Allergies and irritants

Hay fever, post-nasal drip, smoke, dry air and shouting can all make the throat lining puffy and irritated. This swelling is mild and does not affect breathing.

Acid reflux

Stomach acid that rises into the throat (laryngopharyngeal reflux) can cause a feeling of swelling, throat clearing, hoarseness and a lump sensation. It is often worse in the morning or after meals. GERD treatment usually helps.

Serious causes of throat swelling

Anaphylaxis

Anaphylaxis is a severe, whole-body allergic reaction. Swelling of the tongue and throat can begin within minutes of eating a trigger food (peanut, tree nuts, shellfish), an insect sting or a medicine. Other signs are hives, flushing, wheezing, vomiting and feeling faint. It needs an epinephrine auto-injector and a call to 911 straight away.

Angioedema

Angioedema is swelling deep in the skin and lining tissues, often of the lips, eyelids, tongue and throat. It can be allergic, but two non-allergic forms are important:

• ACE inhibitor angioedema: blood pressure medicines such as lisinopril or enalapril can cause sudden tongue and throat swelling, even after years of safe use. There are no hives.
• Hereditary angioedema: a rare inherited condition with repeated swelling attacks, often with belly pain. It does not respond to antihistamines or epinephrine in the usual way.

Epiglottitis

Epiglottitis is infection of the epiglottis. It causes severe throat pain, fever, drooling, a muffled voice and difficulty breathing. It is now uncommon in children because of the Hib vaccine, but it still occurs in adults. It is a medical emergency.

Peritonsillar and deep neck abscesses

A peritonsillar abscess is a pocket of pus beside a tonsil, usually after tonsillitis. It causes severe one-sided pain, a "hot potato" voice, trouble opening the mouth and a uvula pushed to one side. Abscesses deeper in the neck (retropharyngeal or parapharyngeal) can cause neck stiffness and breathing problems. They need drainage.

Injury, burns and swallowed objects

Swallowing very hot liquids, chemicals or a sharp object, or a blow to the front of the neck, can cause rapid swelling. Smoke inhalation in a fire can swell the airway over several hours, even if breathing seems fine at first.

Tumors

A swelling or lump that grows over weeks, with hoarseness, ear pain on one side, trouble swallowing or weight loss, needs an ear, nose and throat (ENT) assessment to rule out throat or laryngeal cancer. Smoking, heavy alcohol use and HPV infection raise the risk.

Throat swelling causes compared

Throat swelling symptoms that suggest the airway is affected

Swelling that narrows the airway produces a recognizable set of signs:

• difficulty breathing, or breathing fast and shallow
• stridor, a high-pitched noise when breathing in
• a hoarse, quiet or muffled voice
• drooling because swallowing saliva hurts or is impossible
• sitting upright and leaning forward to breathe
• anxiety, restlessness or confusion from low oxygen

Any of these means calling 911 or your local emergency number. Do not wait to see if the swelling settles.

How doctors find the cause

A doctor will ask when the swelling started, whether you ate something new or were stung, which medicines you take (especially ACE inhibitors), whether you have a fever, and whether you have had allergic reactions before. They will check your breathing and oxygen level first.

Depending on the findings, tests may include:

• Rapid strep test or throat culture for bacterial infection
• Mono blood test if fatigue and large tonsils suggest it
• Flexible laryngoscopy: a thin camera passed through the nose to look at the voice box and epiglottis
• CT scan of the neck when an abscess or deep infection is suspected
• Allergy testing after recovery from an allergic reaction
• Complement (C4) blood test if hereditary angioedema is suspected

Treatment for a swollen throat

Emergency treatment

• Anaphylaxis: epinephrine injected into the outer thigh as soon as it is suspected, then emergency care. Antihistamines alone are not enough.
• Airway swelling from infection: hospital care with IV antibiotics, steroids and close airway monitoring. Some people need a breathing tube.
• Abscess: needle drainage or a small incision, plus antibiotics.
• ACE inhibitor angioedema: stopping the medicine permanently and monitoring the airway.

Treating common causes

• Strep throat: a full course of antibiotics, usually penicillin or amoxicillin. You stop being contagious about 12 hours after starting them.
• Viral infections and mono: rest, fluids and pain relief. Avoid contact sports for at least 3 to 4 weeks with mono because the spleen can be enlarged.
• Allergic swelling without breathing problems: non-drowsy antihistamines and avoiding the trigger.
• Reflux: smaller meals, no food for 3 hours before bed, raising the head of the bed and acid-reducing medicines.

Home care for a mildly swollen, sore throat

• Drink plenty of cool or warm fluids. Ice chips and popsicles soothe swelling.
• Gargle with warm salt water (about half a teaspoon of salt in a cup of water) several times a day.
• Take acetaminophen (paracetamol) or ibuprofen for pain, following the label dose. Do not give aspirin to children or teenagers.
• Use a cool-mist humidifier and avoid smoke.
• Throat lozenges help adults and older children. Do not give them to young children because of the choking risk.

Preventing throat swelling

• If you have had a serious allergic reaction, carry two epinephrine auto-injectors, wear medical ID and have a written action plan.
• Tell every doctor and pharmacist about past angioedema, especially with ACE inhibitors.
• Wash your hands and avoid sharing cups during cold and flu season.
• Keep up to date with routine vaccines, including Hib for children.
• Stop smoking and limit alcohol to reduce long-term risk of throat cancer.

Frequently asked questions

What are the most common causes of throat swelling?

Viral infections, tonsillitis and strep throat cause most throat swelling. Allergies, post-nasal drip and acid reflux are also common. Less often, swelling comes from anaphylaxis, angioedema, epiglottitis or a throat abscess, which are emergencies because they can block the airway.

When is a swollen throat an emergency?

Call 911 if throat swelling comes with difficulty breathing, noisy breathing, drooling, inability to swallow saliva, a muffled voice, or swelling of the tongue or lips after a food, sting or medicine. These signs mean the airway may be narrowing and can worsen within minutes.

Can throat swelling restrict breathing?

Yes. Swelling of the voice box, epiglottis or tongue base can narrow the airway. Allergic reactions and angioedema can do this within minutes, and severe infections or abscesses over hours. Stridor, a high-pitched sound on breathing in, is a warning sign that needs emergency care.

What is another word for throat swelling?

Doctors call it pharyngeal edema when the throat behind the mouth swells and laryngeal edema when the voice box swells. Angioedema refers to deeper swelling of the lips, tongue and throat. People also describe it as a swollen, tight or closing throat.

How long does throat swelling last?

Swelling from a viral sore throat or tonsillitis usually improves within 3 to 7 days. Mono can take 2 to 4 weeks. Allergic swelling usually settles within hours to a day once treated. Swelling that lasts more than 3 weeks needs a doctor to look for other causes.

Can anxiety make your throat feel swollen?

Yes. Anxiety and reflux commonly cause globus, a feeling of a lump or tightness in the throat with nothing visibly swollen. It does not affect breathing or swallowing food. Real swelling with breathing changes or a voice change is different and needs urgent assessment.