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Tonsillitis is one of the most common reasons patients — especially children — visit an ENT Specialist Singapore. Most of us have experienced it: the raw, scratchy throat, difficulty swallowing, and the unmistakable feeling that something is seriously wrong at the back of the mouth. While a single episode often clears with rest and antibiotics, recurrent or chronic tonsillitis is a different matter — one that can affect sleep, school, work, and quality of life.
In this guide, Dr Gan Eng Cern — ENT Specialist Singapore and fellowship-trained rhinologist — explains everything you need to know: what tonsillitis is, how it differs from pharyngitis, all available treatment options including home remedies, and when surgery is the right choice.
Section 1 of 9What Are Tonsils and What Do They Do?
The tonsils are two oval-shaped masses of lymphoid tissue located at the back of the throat, one on each side. They are part of the lymphatic system — the body's immune network — and serve as a first line of defence against bacteria and viruses entering through the mouth and nose.
Tonsils trap and filter pathogens, produce antibodies, and help the immune system learn to recognise threats. This immune function is most active in early childhood; by adolescence and adulthood, the tonsils play a less critical immunological role, which is why tonsillectomy in adults does not meaningfully weaken the immune system.
Tonsil size naturally varies. They are typically largest between the ages of 3 and 7 — when childhood infection exposure is at its peak — and gradually shrink through adolescence. Proportionally large tonsils in children can obstruct the airway even when not actively infected.
Section 2 of 9What Is Tonsillitis?
Tonsillitis is the inflammation and infection of the tonsils. It occurs when pathogens — most commonly viruses, less often bacteria — infect the tonsillar tissue, triggering an immune response that causes the characteristic swelling, redness, pain, and sometimes pus formation.
Types of Tonsillitis
| Type | Duration | Key Feature | Common Cause |
|---|---|---|---|
| Acute Tonsillitis | Under 2 weeks | Single episode; usually responds to treatment | Virus (most common) or Group A Strep bacteria |
| Recurrent Tonsillitis | Multiple episodes per year | 7+ episodes/year, 5+/year for 2 years, or 3+/year for 3 years | Usually bacterial (streptococcal); biofilm formation |
| Chronic Tonsillitis | Persistent beyond 2 weeks | Ongoing low-grade symptoms; enlarged tonsils | Bacterial biofilm; chronic inflammation |
| Peritonsillar Abscess | Active episode + complication | Pus collection around the tonsil; unilateral pain and trismus | Complication of bacterial tonsillitis — see ENT urgently |
Biofilms deserve special mention: in recurrent tonsillitis, bacteria form a protective film on the tonsillar surface that is resistant to antibiotics. This is why recurrent tonsillitis does not fully clear with repeated antibiotic courses. Tonsillectomy is the definitive solution because it removes the tissue the biofilm lives on.
Section 3 of 9What Causes Tonsillitis?
Viral Causes (Most Common)
The majority of tonsillitis episodes — especially in children — are caused by viruses. Common viral causes include:
- Rhinovirus (common cold) — the most frequent cause
- Adenovirus — often causes both tonsillitis and conjunctivitis together
- Influenza virus — tonsillitis as part of a flu syndrome
- Epstein-Barr virus (EBV) — causes infectious mononucleosis ('mono' or 'glandular fever'); characterised by severe tonsillitis, extreme fatigue, and enlarged lymph nodes
- Enterovirus — including hand, foot and mouth disease (Coxsackievirus)
Bacterial Causes
Bacterial tonsillitis is less common but clinically significant because it can cause serious complications if untreated:
- Group A Streptococcus (GAS) — the most important bacterial cause; causes 'strep throat'. Requires antibiotics to prevent complications such as rheumatic fever.
- Staphylococcus aureus — occasionally causes tonsillar abscess
- Haemophilus influenzae — less common; more likely in immunocompromised patients
- Fusobacterium necrophorum — associated with Lemierre's syndrome, a rare but serious complication in adolescents
How to tell the difference: Viral tonsillitis typically presents alongside cold-like symptoms (runny nose, cough, hoarseness). Bacterial tonsillitis (strep throat) usually presents with sudden severe sore throat, high fever, swollen lymph nodes, and white or yellow patches on the tonsils — without runny nose or cough. A rapid strep test or throat swab can confirm.
Symptoms of Tonsillitis — and How It Differs from Pharyngitis
Understanding the difference between tonsillitis and pharyngitis matters for correct treatment. Both are common causes of sore throat in Singapore, but they involve different structures and require different management.
Common Symptoms of Tonsillitis
- Sore throat — often severe, especially on swallowing
- Swollen, red tonsils — may have white or yellow patches or coating of pus
- Difficulty or pain on swallowing (odynophagia)
- Enlarged, tender lymph nodes in the neck (cervical lymphadenopathy)
- Fever — may be high in bacterial tonsillitis
- Scratchy or muffled voice — 'hot potato voice'
- Bad breath (halitosis) — from bacterial infection and pus
- Ear pain — referred pain via the shared nerve supply between the tonsils and ear
- In children: drooling, refusal to eat, irritability
Tonsillitis vs Pharyngitis — Key Differences
| Feature | Tonsillitis | Pharyngitis |
|---|---|---|
| Primary site | Tonsils (palatine tonsils at sides of throat) | Pharynx (area of the throat surrounding the tonsils) |
| Common cause | Viral or bacterial (strep) | Mostly viral (rhinovirus, adenovirus) |
| Visual appearance | Swollen tonsils; possible pus/exudate on tonsil surface | Redness and inflammation of the back throat wall; no tonsillar exudate |
| Lymph node swelling | Prominent — especially anterior cervical nodes | Mild to moderate |
| Associated cold symptoms | Usually absent in bacterial; may be present in viral | Commonly present (runny nose, cough, hoarseness) |
| Fever | Common; often high in strep tonsillitis | Usually mild to moderate |
| Treatment | Antibiotics if bacterial; rest and fluids if viral | Usually supportive; antibiotics only if bacterial cause confirmed |
| When to see ENT | Recurrent episodes, suspected abscess, difficulty breathing | Persistent symptoms beyond 2 weeks; suspected glandular fever |
An important distinction: while the terms 'strep throat' and 'tonsillitis' are often used interchangeably, they are not the same. Strep throat is a specific type of bacterial tonsillitis caused by Group A Streptococcus. You can have tonsillitis (viral) without strep throat.
Section 5 of 9How Is Tonsillitis Diagnosed?
Diagnosis begins with a clinical history and physical examination. An ENT Specialist Singapore will examine the throat directly and assess the tonsils, lymph nodes, and surrounding structures. Diagnostic tests may include:
- Rapid Strep Test — a quick throat swab detecting Group A Streptococcus antigens within minutes. Useful for guiding immediate antibiotic decisions.
- Throat swab culture — more accurate than rapid strep; identifies the specific bacteria and antibiotic sensitivity. Results take 24–48 hours.
- Monospot test (Paul-Bunnell test) — blood test for Epstein-Barr virus (EBV/glandular fever). Important because EBV tonsillitis should NOT be treated with amoxicillin — it causes a characteristic rash.
- Full blood count (FBC) — can show raised white cell count indicating bacterial infection, or atypical lymphocytes suggesting viral infection (especially EBV).
- Nasal endoscopy — performed by an ENT specialist to assess the post-nasal space, adenoids, and surrounding structures, particularly relevant in children with recurrent tonsillitis and suspected adenoid enlargement.
Treatment of Tonsillitis
Medical Treatment
| Treatment | When Used | Notes |
|---|---|---|
| Rest and hydration | All tonsillitis episodes | Adequate fluid intake is essential; throat pain reduces oral intake |
| Oral analgesics (paracetamol / ibuprofen) | Pain and fever management | Ibuprofen has anti-inflammatory benefit; avoid aspirin in children |
| Throat lozenges and gargles | Symptom relief for mild to moderate episodes | Temporary relief only; not curative |
| Antibiotics (penicillin-based first line) | Confirmed or suspected bacterial tonsillitis | A full 10-day course is essential; incomplete courses promote resistance |
| Alternative antibiotics (amoxicillin-clavulanate, erythromycin) | Penicillin allergy or treatment failure | Never give amoxicillin for suspected glandular fever (EBV) |
| Corticosteroids (short course) | Severe swelling; peritonsillar oedema | Reduces tonsillar oedema rapidly; used with antibiotics |
| Surgical drainage | Peritonsillar abscess (quinsy) | Needle aspiration or incision and drainage; ENT specialist procedure |
Home Remedies for Tonsillitis
Home remedies are effective for symptom relief during viral tonsillitis and as supportive care alongside medical treatment for bacterial tonsillitis. They do not replace antibiotics when bacterial infection is present, but they meaningfully reduce pain and discomfort.
- Warm saltwater gargle — Mix half a teaspoon of non-iodised salt in a glass of warm water; gargle for 30 seconds, 3–4 times daily. Salt creates an environment inhospitable to bacteria, draws fluid out of swollen tonsillar tissue, and soothes irritation.
- Honey and lemon in warm water — honey has natural antibacterial and anti-inflammatory properties; lemon provides vitamin C. Mix one tablespoon of raw honey and the juice of half a lemon in a cup of warm water. Do not give honey to children under 12 months old.
- Ice chips and cold fluids — cold temperatures numb the throat and reduce swelling. Ice chips, cold water, or ice cream can provide meaningful relief. Particularly useful in children who refuse oral intake due to pain.
- Steam inhalation — inhaling steam from a bowl of hot water (with head covered by a towel) helps moisten the throat, loosen mucus, and ease post-nasal drip.
- Turmeric in warm milk — curcumin in turmeric has well-documented anti-inflammatory and antimicrobial properties. Mix half a teaspoon of turmeric powder into a glass of warm milk; drink once or twice daily.
- Ginger tea with honey — ginger contains gingerols and shogaols with anti-inflammatory activity. Steep fresh ginger slices in hot water for 5 minutes; add honey.
- Soft, easy-to-swallow diet — stick to soft foods: porridge, soup, yoghurt, scrambled eggs, ice cream, or smoothies. Cold and lukewarm foods are typically better tolerated than hot.
- Adequate rest — viral tonsillitis resolves faster with genuine rest. Physical activity can prolong viral illness.
Home remedies are supportive — they relieve symptoms but do not treat bacterial infection. If you have high fever (above 38.5°C), difficulty breathing or swallowing, a muffled 'hot potato' voice, or swelling visible on one side of the throat that pushes the uvula to one side — seek medical attention immediately. These are signs of peritonsillar abscess requiring urgent ENT drainage.
Need Medical Advice from an ENT Specialist?
No referral is required. Whether you are seeking a diagnosis, treatment advice or a second opinion, Dr Gan provides specialist assessment and personalised treatment planning.
Contact UsComplications of Untreated Tonsillitis
Leaving bacterial tonsillitis untreated — or failing to complete antibiotic courses — carries real risks:
- Peritonsillar abscess (quinsy) — pus collection between the tonsil and the surrounding tissue. Causes severe unilateral throat pain, trismus (difficulty opening the mouth), and a 'hot potato' voice. Requires urgent ENT drainage and IV antibiotics.
- Rheumatic fever — a serious complication of untreated Group A Strep tonsillitis. Immune-mediated damage to the heart valves, joints, and brain. Entirely preventable with a full antibiotic course.
- Post-streptococcal glomerulonephritis — immune-mediated inflammation of the kidneys following strep infection. Preventable with antibiotics.
- Obstructive sleep apnoea (OSA) — chronically enlarged tonsils can obstruct the airway during sleep, causing OSA with cardiovascular and cognitive consequences.
- Parapharyngeal or retropharyngeal abscess — deeper neck space infection; rare but life-threatening. Requires hospital admission and often surgical drainage.
- Lemierre's syndrome — rare but serious; caused by Fusobacterium spread from tonsillar infection into the jugular vein. Medical emergency. More common in adolescents.
When Should You See an ENT Specialist for Tonsillitis?
See an ENT Specialist Singapore if:
- Tonsillitis recurs 7 or more times in one year
- Tonsillitis recurs 5 or more times per year for 2 consecutive years
- Tonsillitis recurs 3 or more times per year for 3 consecutive years
- Episodes require hospitalisation or significant time off work/school
- Antibiotics repeatedly fail to fully clear the infection
- You suspect peritonsillar abscess — severe unilateral pain, trismus, 'hot potato' voice
- Your child has snoring, mouth breathing, or witnessed sleep apnoea
- Tonsils are persistently enlarged, causing difficulty swallowing or breathing
- A quinsy (peritonsillar abscess) has been drained — high recurrence risk; tonsillectomy often recommended
For detailed information on tonsillectomy criteria and recovery in adults, see our Signs You Need a Tonsillectomy guide. For paediatric tonsillectomy, see our Tonsillectomy Guide for Parents.
Section 9 of 9Frequently Asked Questions
The viruses and bacteria that cause tonsillitis are contagious — they spread through saliva, respiratory droplets, and contaminated surfaces. Tonsillitis itself is not directly transmitted. The risk of transmission is highest in the first 24–48 hours of illness. A person on antibiotics for bacterial tonsillitis is generally no longer contagious after 24 hours of treatment.
No — tonsillectomy removes the palatine tonsils completely. You cannot get tonsillitis after tonsillectomy. However, you can still get sore throats from other causes: cold, flu, post-nasal drip, acid reflux, and pharyngitis. Tonsillectomy eliminates recurrent tonsillitis specifically.
No. Multiple large studies have confirmed that tonsillectomy does not clinically weaken the immune system. The tonsils play a proportionally smaller immunological role in adults and older children than in infants. The rest of the lymphatic system provides robust immune function independently of the tonsils.
Yes. Tonsillectomy is a Medisave-claimable procedure when performed for appropriate clinical indications at an accredited clinic such as Dr Gan's at Mount Elizabeth Novena Hospital. For cost information, see our ENT Specialist cost guide.
Viral tonsillitis typically resolves on its own within 7–10 days with supportive care. Bacterial tonsillitis requires antibiotics — without treatment it may resolve, but incompletely and slowly, with significant complication risk. Recurrent tonsillitis does not resolve on its own and typically requires ENT assessment.
- Tonsillitis is inflammation and infection of the tonsils — caused by viruses (most common) or bacteria. Viral tonsillitis resolves in 7–10 days; bacterial tonsillitis requires antibiotics.
- Recurrent tonsillitis is driven by bacterial biofilms that antibiotics cannot fully clear. Tonsillectomy is the definitive solution — it removes the tissue the biofilm lives on.
- Tonsillitis and pharyngitis are different conditions affecting different throat structures. Strep throat is a specific type of bacterial tonsillitis, not a synonym for all sore throats.
- Home remedies (salt gargle, honey and lemon, cold fluids, rest) are effective for symptom relief during viral tonsillitis but do not replace antibiotics for bacterial infection.
- See an ENT Specialist Singapore if tonsillitis recurs 7+ times per year, episodes require hospitalisation, antibiotics fail, or complications such as quinsy are suspected.
About Dr Gan Eng Cern
This article is medically reviewed by Dr Gan Eng Cern, a fellowship-trained ENT specialist and rhinologist practising at Mount Elizabeth Novena Hospital in Singapore. Dr Gan holds an MBBS (University of New South Wales), MRCS (Edinburgh), MMed in ENT (NUS), and FAMS.
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ENT Specialist & Rhinologist · Mount Elizabeth Novena Hospital
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Medical Disclaimer: The information on this page is for general educational purposes only. It does not constitute medical advice and is not a substitute for a formal clinical assessment by a qualified specialist. In an emergency, go to the nearest A&E department or call 995.
Last updated: April 30, 2026 · © Dr Gan Eng Cern ENT Clinic
