Acute Tonsillitis in Adults: How to Recognize, Treat, and Prevent Complications

Contrary to popular belief, tonsillitis (acute inflammation of the tonsils) does not only affect children. In adults, it can be particularly debilitating and, in some cases, may lead to serious complications if not properly managed. Here is everything you need to know to recognize it and get the right treatment.

What Is Acute Tonsillitis?

Tonsillitis refers to acute inflammation of the palatine tonsils, the two masses of lymphoid tissue located on either side at the back of the throat. It typically causes severe pain when swallowing, often accompanied by fever and fatigue.

The Two Main Causes of Tonsillitis in Adults

1. Viral Tonsillitis (60–75% of Cases)

Most cases of tonsillitis in adults are caused by viruses, including rhinoviruses, adenoviruses, influenza viruses, and the Epstein-Barr virus (which causes infectious mononucleosis). They usually resolve on their own within about a week and do not require antibiotics.

Typical features:

• Gradual onset
• Often associated with a runny nose, cough, or hoarseness
• Moderate fever
• Red tonsils, sometimes with a mild whitish coating

2. Bacterial Tonsillitis (Streptococcal, 25–40% of Cases)

Bacterial tonsillitis is mainly caused by Group A Streptococcus. When confirmed, it requires antibiotic treatment to reduce the risk of rare but potentially serious complications.

Typical features:

• Sudden and severe onset
• Absence of an associated cough or runny nose
• High fever (above 38.5°C)
• Very red tonsils with white spots or a purulent coating
• Painful and swollen cervical lymph nodes
• Severe throat pain that may make eating difficult

The Clinical Score Used to Guide Diagnosis

Doctors may use the McIsaac score to estimate the likelihood of a bacterial infection:

• Fever above 38°C (+1 point)
• Absence of cough (+1 point)
• Tender cervical lymph nodes (+1 point)
• Enlarged tonsils with exudate (+1 point)
• Age 15–44 years (0 points); age 45 and older (-1 point)

A higher score may indicate the need for a rapid diagnostic test (RDT) for Group A Streptococcus, which can help confirm or rule out a bacterial infection within minutes.

Possible Complications of Untreated Tonsillitis

Local Complications

• Peritonsillar abscess: a collection of pus around the tonsil that can cause severe one-sided throat pain, difficulty opening the mouth (trismus), and a muffled voice. It requires urgent medical treatment and drainage.
• Retropharyngeal abscess: rarer but potentially serious, with a risk of the infection spreading to deeper tissues.

General Complications of Untreated Streptococcal Tonsillitis

• Acute rheumatic fever: an inflammatory condition that can affect the heart and joints. It is now rare in settings where appropriate antibiotic treatment is available.
• Post-streptococcal glomerulonephritis: a kidney complication following a streptococcal infection.
• Scarlet fever: a characteristic skin rash associated with a streptococcal infection.

When Should You Seek Urgent Medical Care?

Seek urgent medical attention if you experience:

• Significant difficulty swallowing saliva
• Difficulty breathing or opening your mouth
• Severe one-sided throat pain with a muffled voice, which may suggest a peritonsillar abscess
• Very high fever that does not respond to fever-reducing medication
• Significant deterioration in your general condition
• Symptoms that worsen after 3–4 days of treatment

Adult Acute Angina Treatment

The appropriate adult acute angina treatment depends on whether the infection is viral or bacterial.

Viral Tonsillitis

Treatment is mainly aimed at relieving symptoms:

• Painkillers and fever-reducing medication, such as paracetamol or ibuprofen
• Plenty of fluids
• Throat lozenges or local anesthetic sprays
• Rest
• Symptoms generally resolve on their own within 5–8 days

Antibiotics are not effective against viral infections.

Bacterial Tonsillitis

When a bacterial infection is confirmed or antibiotic treatment is otherwise medically indicated, the doctor may prescribe antibiotics such as amoxicillin as a first-line treatment, when appropriate and in the absence of an allergy. Treatment duration depends on the specific clinical situation and the antibiotic prescribed.

If you are allergic to penicillin, your doctor can choose an appropriate alternative antibiotic.

Important: Never start, stop, or change an antibiotic treatment without medical advice. If antibiotics are prescribed, follow the doctor's instructions carefully and complete the prescribed course unless your doctor tells you otherwise.

Recurrent Tonsillitis: When Should Tonsillectomy Be Considered?

For adults who experience recurrent episodes of tonsillitis, particularly when they significantly affect daily life, a consultation with an ENT specialist can help determine whether a tonsillectomy (surgical removal of the tonsils) may be appropriate.

The decision depends on factors such as the frequency and severity of episodes, complications, and their impact on quality of life.

Which Specialist Should You Consult in Morocco?

• General practitioner: for the initial diagnosis and first-line treatment → docdialy.com/General-practitioner
• ENT specialist: for recurrent tonsillitis, complications, or atypical cases → docdialy.com/ent

Conclusion

Acute tonsillitis in adults is generally a benign condition that improves within a few days. However, it deserves particular attention when symptoms are severe, recurrent, or accompanied by unusual warning signs. An accurate diagnosis helps identify bacterial infections, prevent complications, and ensure appropriate treatment.

If you are unsure about your symptoms or they persist, consult a doctor on Docdialy.

→ Consult an ENT specialist in Morocco: docdialy.com/ent