Why Do Tonsils Get Infected? Causes, Symptoms, and Care
Tonsil infection (also known as tonsillitis) is a very common throat condition, especially among children and younger adults. It is characterised by inflammation of the tonsils—two small, oval-shaped pads located at each side of the throat.
While a tonsil infection is often viral, bacterial infections can also occur, and treatment depends largely on the underlying cause.
In this article, we will discuss what tonsils are and their function in the body, what the causes and symptoms of a tonsil infection are, and what you should do if you have tonsillitis.
Key Takeaways
- Tonsillitis is a common throat infection, especially in children and younger adults, where the tonsils on each side of the throat become inflamed.
- Tonsils are part of the immune system and help detect germs entering through the nose or mouth.
- Most cases are viral and improve with supportive care, while confirmed bacterial tonsillitis may require antibiotics.
- Typical symptoms include sore throat, painful swallowing, fever and swollen neck lymph nodes.
- Tonsil stones are calcified deposits in the tonsil crevices that are usually harmless but can cause bad breath, sore throat or ear discomfort.
What Do Tonsils Do in Our Body?
Tonsils are part of the immune system. They help trap germs and play a role in the body’s immune response to infection. Due to their position, tonsils help “filter” germs that enter through the nose or mouth before they travel deeper into the respiratory system.
Children are more prone to tonsil infections as their immune systems are still developing. In adolescents and younger adults, higher exposure in close-contact environments—such as schools or shared living spaces—may also increase the likelihood of infection.
Children with frequent or recurrent tonsillitis may benefit from a paediatric ENT assessment to determine whether further evaluation is appropriate.
Symptoms of Tonsillitis
Symptoms of a tonsil infection can range from mild to severe, depending on the cause and extent of inflammation. Common signs and symptoms include:
- Sore or itchy throat
- Pain or difficulty swallowing
- Hoarseness of voice
- Fever
On examination, tonsillitis often causes redness and swelling of the tonsils and surrounding throat tissue.
Some individuals may also experience swollen lymph nodes (glands located along the sides of the neck), headache, or general fatigue. In children, symptoms can include stomachache or vomiting, as well as irritability or refusal to eat or drink due to throat discomfort.
What Causes Tonsillitis?
- Common cold viruses
- Influenza (flu) viruses
- Epstein-Barr virus, which causes infectious mononucleosis
Viral tonsillitis typically resolves on its own with rest and supportive care.
Bacterial tonsillitis is less common but may cause more pronounced symptoms. The most frequent bacterial cause is Group A Streptococcus, commonly referred to as strep throat.
Because symptoms of viral and bacterial tonsillitis can overlap, a throat swab test may be recommended to identify streptococcal infection. If a bacterial cause is confirmed, antibiotics are usually prescribed to treat the infection and reduce the risk of complications.
Is Tonsillitis Contagious?
Tonsillitis caused by viral or bacterial infections can be contagious, particularly in close-contact settings. It may spread through:
- Coughing or sneezing
- Sharing food, drinks, or utensils
- Touching contaminated surfaces and then touching the mouth or nose
- Close contact with someone who is unwell
Practising good hygiene plays an important role in reducing the risk of transmission.
To learn more about tonsillitis, schedule an appointment with ENT Specialist Dr Dennis Chua.
How to Manage Tonsillitis
Early assessment and appropriate management are important in treating tonsillitis. Consulting a doctor helps determine whether the infection is viral or bacterial and guides suitable treatment.
Self-Care for Mild Tonsil Infection
For many viral infections, symptoms improve within 7–10 days. Supportive care may include:
- Drinking plenty of fluids such as water, warm tea, or soup
- Gargling with warm salt water to ease throat irritation
- Using throat lozenges for symptom relief
- Getting adequate rest and sleep
- Taking pain relievers such as paracetamol or ibuprofen, as advised by a doctor
Medical Treatment
If bacterial tonsillitis is diagnosed, antibiotics may be prescribed. It is important to complete the full course of antibiotics even if symptoms improve early.
In some individuals with frequent, severe, or chronic tonsil infections, surgical removal of the tonsils (tonsillectomy) may be considered after careful clinical evaluation.
Can Tonsillitis Be Prevented?
While tonsillitis cannot always be prevented, the risk of infection can be reduced through simple measures:
- Washing hands regularly, especially before touching the face
- Avoiding close contact with others when unwell
- No sharing of food, drinks, or utensils
- Replacing toothbrushes regularly, particularly after an infection
- Maintaining balanced nutrition and adequate rest
For younger children, keeping them at home while they are unwell helps reduce the risk of transmission. The decision to return to school should be guided by symptom resolution and medical advice where appropriate.
Tonsil Stones: What Are They?
Tonsil stones (also known as tonsilloliths) are small accumulations of calcified material that form in the crevices of the tonsils. They can develop from hardened minerals, food debris, bacteria, or fungi.
Tonsil stones are generally harmless but may cause symptoms such as:
- Bad breath
- Sore throat
- Ear discomfort
They often appear as small white or yellowish particles and are more commonly seen in people with recurrent tonsillitis, enlarged tonsillar crypts, or dehydration.
Tonsil stones may dislodge on their own, especially when underlying contributing factors improve. Meanwhile, persistent or recurrent cases may warrant medical evaluation.
Research Insight from Local Medical Literature
A study published in the Singapore Medical Journal examined the bacteriology of tonsils removed from 233 children and adults who underwent tonsillectomy between January 2000 and June 2003.
The study reported that organisms such as Klebsiella pneumoniae, Streptococcus pneumoniae, Escherichia coli, and Enterobacter species were more commonly isolated in adults, while Haemophilus influenzae and Streptococcus pyogenes were more frequently identified in children. Staphylococcus aureus was the most commonly cultured organism overall.
It is important to note that these findings were based on cultures from excised tonsillar tissue and may reflect bacterial colonisation rather than the direct cause of recurrent tonsillitis. The study did not establish a clear causal relationship between specific bacteria and recurrence but contributed to a broader understanding of tonsillar microbiology.
Practical Takeaway
Tonsillitis is a common condition, particularly among children and adolescents. It may be caused by viral or bacterial infections and can spread through close contact. Symptoms and management vary depending on the underlying cause, and treatment decisions are based on clinical assessment.
Individuals experiencing persistent, severe, or recurrent symptoms may benefit from medical evaluation to determine the most appropriate course of care.
If you’re feeling any of the signs or symptoms of tonsillitis, you may book a consultation with ENT Specialist Dr Dennis Chua.
you may book a consultation with Dr Dennis Chua, an ENT specialist in Singapore.
He has completed his training in otorhinolaryngology locally and attained qualifications internationally.
About Dr Dennis Chua
Dr. Dennis Chua is an Ear, Nose and Throat (ENT) specialist with more than a decade of experience. He is held in high regard within the field of Otolaryngology, having published many articles in peer reviewed journals on the topic of ENT.
As an ENT Specialist in Singapore, Dr Dennis Chua is committed to providing thorough, patient-centred care for both adults and children. Whether you’re managing allergies, sinus problems, hearing issues, or throat concerns, we take time to understand your condition and guide you through your treatment options.
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