Tonsillitis

Tonsillitis is inflammation of the tonsils, the small areas of immune tissue at the back of the throat. It is usually caused by a viral infection, but bacteria such as group A Streptococcus can also cause it. Tonsillitis is common in children and teenagers, although people of any age can develop it. Understanding what is tonsillitis and what caused it helps guide the right treatment.

Tonsillitis symptoms can vary depending on whether the cause is viral or bacterial and on the person’s age. Looking in the throat may show red, enlarged tonsils or white patches, but appearance alone cannot confirm the diagnosis. A clinician may need to consider the full set of symptoms and, when appropriate, perform testing.

Tonsillitis itself is inflammation, but the viral or bacterial infection causing it may be contagious. These infections can spread through coughs, sneezes, saliva, shared utensils, or close contact with an infected person. A person may be most likely to spread infection while experiencing active symptoms, although the exact period varies by cause. Antibiotics and tonsillitis are connected only when bacteria are responsible; antibiotics do not stop viral spread or treat viral tonsillitis.

Having one of these risk factors does not mean someone will develop tonsillitis. Many cases occur without a single identifiable risk factor, and exposure to an infection does not always lead to illness.

Most cases improve without serious problems, but untreated or severe infections can occasionally cause complications. These may include dehydration, a collection of pus beside a tonsil called a peritonsillar abscess, or spread of the infection to nearby tissues. Prompt assessment is important when symptoms are severe or worsening.

A clinician will ask about the illness and examine the throat, including the tonsils for redness, swelling, and white or yellow patches. They may also check for fever and tender glands in the neck, along with other signs that help distinguish possible causes.

Testing for a Bacterial Cause

A rapid strep test or throat culture may be used to check for group A Streptococcus when the examination and symptoms suggest bacterial tonsillitis. Testing helps guide antibiotic decisions, because antibiotics do not treat viral tonsillitis. A healthcare professional can explain which test is appropriate and how results affect care.

Tonsillectomy may be discussed for repeated severe infections, persistent tonsil enlargement that causes breathing or sleep problems, or complications. Surgery is not routine for a single uncomplicated episode, and a specialist can help weigh its potential benefits and risks.

These steps can reduce exposure to infections that cause tonsillitis, but they cannot prevent every viral or bacterial infection.

Many cases of tonsillitis improve within several days to about a week. Recovery can vary depending on the cause, severity of symptoms, hydration, and whether treatment is needed. Recurrent episodes may require a broader evaluation rather than repeated treatment of each episode alone.