What Do Swollen Tonsils Look Like?

Swollen tonsils look like red, enlarged lumps at the back of your throat. They may have white or yellow patches on them. The swelling can make the opening of your throat look smaller. Sometimes both tonsils swell evenly. Other times one side looks worse than the other. Along with the swelling, the surrounding tissue may be red and inflamed.

What Do Swollen Tonsils Look Like?

Healthy tonsils are two pink, oval-shaped pads of tissue at the back of your mouth — one on each side. When they swell, they turn bright red and grow larger. They often look bumpy or irregular on the surface. In many cases, you can see white or yellow spots of pus on them. This is called tonsillar exudate.

The swelling can range from mild to severe. Mildly swollen tonsils may just look slightly larger than normal and a little pinker. Severely swollen tonsils can almost touch each other in the middle. This is sometimes called “kissing tonsils.”

Swollen tonsils may also cause the uvula (the small piece of tissue that hangs down at the back of your throat) to look red and puffy. Your voice may sound muffled, and swallowing can hurt.

What Causes Tonsils to Swell?

Tonsils swell most often because of an infection. The tonsils are part of your immune system. When they trap viruses or bacteria, they become inflamed as your body fights the germs.

Common causes include:

• Viral infections — such as the common cold, flu, or mononucleosis (often called mono). Viruses are the most common cause of tonsil swelling.
• Bacterial infections — most notably strep throat caused by Group A Streptococcus bacteria. Bacterial tonsillitis often causes heavier pus and more intense pain than viral infections.
• Allergies — seasonal allergies or dust can cause chronic mild swelling.
• Irritants — smoke, dry air, or acid reflux can inflame the tonsils.
• Tonsil stones — hardened debris that forms in the tonsil crypts (small pockets on the surface). These can cause swelling and discomfort.

Rarely, swelling on only one side that does not go away could signal a more serious condition, such as a peritonsillar abscess or even a tumor. This is not common, but it is important to have any one-sided swelling that lasts checked by a doctor.

How Can You Tell If Swollen Tonsils Are From a Virus or Bacteria?

It can be hard to tell the difference just by looking at your throat. Both viral and bacterial infections can cause red, swollen tonsils with white patches. However, some clues may help.

Bacterial strep throat often causes:

• Red and swollen tonsils with white or yellow pus.
• Tiny red spots on the roof of the mouth.
• A sudden, severe sore throat.
• Fever, especially over 101°F.
• Swollen, tender lymph nodes in the neck.
• No cough or runny nose.

Viral tonsillitis more likely includes:

• Cough, runny nose, or hoarseness.
• Mild or moderate sore throat.
• Low-grade fever.
• General cold symptoms.

These patterns are not guaranteed. Viral infections like mono can cause heavy pus and severe swelling, too. The only reliable way to know is with a throat swab and lab test. If you suspect strep, see a doctor for testing. Untreated strep can lead to complications like rheumatic fever.

When Should You See a Doctor for Swollen Tonsils?

Most cases of swollen tonsils get better on their own within a few days, especially if they are caused by a virus. But some situations require medical attention.

See a doctor if you or your child have:

• Difficulty breathing or swallowing.
• Drooling (in a child) — this can signal severe swelling.
• Muffled voice or trouble opening the mouth fully.
• A fever over 101°F that lasts more than 24 hours.
• Severe pain that prevents eating or drinking.
• Swollen tonsils that last more than one week.
• Swelling on only one side that persists.
• Frequent episodes of tonsillitis (more than five or six per year).

For children, watch for signs of dehydration, such as fewer wet diapers or dry mouth. If your child cannot swallow liquids, they may need medical care quickly.

A doctor will examine your throat, feel your neck for swollen glands, and may do a rapid strep test or throat culture. If tonsillitis keeps coming back, a person may be a candidate for a tonsillectomy — surgery to remove the tonsils. This decision is made on a case-by-case basis.

Can Swollen Tonsils Be Prevented?

You cannot always prevent swollen tonsils because they are a normal immune response. But you can lower your risk of infections that cause swelling.

Good hygiene helps reduce the spread of bacteria and viruses. Wash your hands regularly. Avoid sharing utensils, cups, or toothbrushes with someone who is sick. Keep your distance from people with colds or sore throats.

If you have allergies, managing them with antihistamines or avoiding triggers may reduce chronic mild swelling. Staying hydrated and using a humidifier in dry air can also help soothe the throat.

Smoking or vaping can irritate the tonsils. Avoiding tobacco products may prevent some swelling.

There is no reliable evidence that any supplement or home remedy prevents tonsillitis. Some people think gargling salt water helps, but it has not been proven to stop infections. It may provide temporary comfort.

What Is the Difference Between Tonsillitis and Strep Throat?

Tonsillitis is a general term for inflammation of the tonsils, whether caused by a virus or bacteria. Strep throat is a specific bacterial infection caused by Group A Streptococcus. All strep throat involves tonsillitis, but not all tonsillitis is strep throat.

The symptoms can overlap. Both can cause red, swollen tonsils with pus. But strep throat often has more distinct features, such as a higher fever and lack of cough. A throat culture is the only way to be sure.

Treatment differs. Viral tonsillitis does not improve with antibiotics. Strep throat does. If you are diagnosed with strep, you need a full course of antibiotics, usually penicillin or amoxicillin. Taking them properly prevents complications and reduces contagiousness.