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Sore Throat – Causes, Symptoms and Treatment

A sore throat is an inflammation of the throat area causing pain, difficulty swallowing, and redness. It commonly occurs with colds or bacterial infections.

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A sore throat is an inflammation of the throat area causing pain, difficulty swallowing, and redness. It commonly occurs with colds or bacterial infections.

What Is a Sore Throat?

A sore throat (medically known as pharyngitis or tonsillitis) is an inflammation of the mucous membranes lining the throat and pharynx. It is one of the most common medical complaints and can affect people of all ages. Depending on the specific structures involved, it may be classified as pharyngitis (inflammation of the pharynx) or tonsillitis (inflammation of the tonsils). Both conditions can occur simultaneously.

Causes

Sore throats are most commonly caused by viruses, and less frequently by bacteria. Common causes include:

Viruses: Rhinoviruses (common cold), influenza viruses, adenoviruses, Epstein-Barr virus (infectious mononucleosis)
Bacteria: Group A Streptococcus (the most frequent bacterial cause), Staphylococcus
Irritants: Dry air, smoking, allergies, chemical irritants

Viral sore throats are often part of a general cold and spread through droplet infection or direct contact with an infected person.

Symptoms

Typical symptoms of a sore throat include:

Throat pain, especially when swallowing
Redness and swelling of the throat lining
Hoarseness or changes in voice
Swollen lymph nodes in the neck
General malaise and fatigue
Fever (more common with bacterial infections)
White or yellowish patches on the tonsils (suggesting bacterial infection)

Diagnosis

A sore throat is usually diagnosed through a clinical examination by a healthcare provider, who inspects the throat using a tongue depressor and light source. To distinguish between viral and bacterial infections, the following methods may be used:

Throat swab: A sample from the throat lining is tested for bacteria, particularly Streptococcus.
Rapid strep test: A quick bedside test that delivers results within minutes.
Blood tests: Used when infectious mononucleosis is suspected or to assess the degree of inflammation.

Treatment

Viral Sore Throat

Since viruses cannot be treated with antibiotics, management focuses on symptomatic relief:

Adequate rest and recuperation
Drinking plenty of fluids (warm teas, water)
Pain-relieving and fever-reducing medications such as ibuprofen or paracetamol (acetaminophen)
Lozenges, throat sprays, or gargling solutions for local symptom relief
Humidifying dry indoor air

Bacterial Sore Throat

When a bacterial infection is confirmed, particularly streptococcal infection, antibiotics are prescribed. The first-line treatment is typically penicillin V, or for patients with penicillin allergy, alternatives such as amoxicillin or clindamycin. Completing the full course of antibiotics is essential to prevent serious complications such as rheumatic fever or kidney disease.

When to See a Doctor

Medical attention is recommended when:

Fever exceeds 38.5 °C (101.3 °F)
There is severe difficulty swallowing or breathing
Symptoms persist for more than 5–7 days
A streptococcal infection is suspected (tonsil patches, high fever)
A child is affected

Complications

With timely and appropriate treatment, a sore throat usually resolves without complications. However, untreated bacterial infections can lead to:

Peritonsillar abscess: A collection of pus next to the tonsil
Rheumatic fever: An inflammatory condition affecting the heart, joints, and other organs
Post-streptococcal glomerulonephritis: An inflammatory kidney disease
Spread of infection to adjacent structures (e.g., middle ear infection, sinusitis)

Prevention

While sore throats cannot always be prevented, the following measures can reduce the risk:

Regular and thorough handwashing
Avoiding close contact with infected individuals
Not smoking
Staying well hydrated and maintaining a healthy diet
Supporting the immune system through adequate sleep and physical activity

References

World Health Organization (WHO): Acute Respiratory Infections – Pharyngitis and Tonsillitis Overview. Geneva, 2022.
Shulman ST et al. – Clinical Practice Guideline for the Diagnosis and Management of Group A Streptococcal Pharyngitis. Infectious Diseases Society of America (IDSA), Clinical Infectious Diseases, 2012.
Linder JA, Bates DW, Lee GM, Finkelstein JA – Antibiotic treatment of children with sore throat. JAMA, 2005;294(18):2315-2322.

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