Swollen Tonsils: Causes and Symptoms

The palatine tonsils are two lymphoid organs located at the back of the throat. A swollen tonsil most often indicates tonsillitis, that is, inflammation of the tonsils, which is viral in the majority of cases and more rarely bacterial (particularly Group A streptococcus). In common practice in France, the term angina refers to this inflammation of the tonsils; tonsillitis and angina are therefore most often used as synonyms. In a stricter sense, some clinicians distinguish pharyngitis (inflammation of the pharynx) from tonsillitis (inflammation centered on the tonsils).

Viral infection

Rhinoviruses, adenoviruses, influenza, or other respiratory viruses frequently cause bilateral swollen tonsils, which may sometimes be asymmetrical. Symptoms are mild, fever is mild to absent, and the condition typically resolves within a few days with symptomatic treatment.

Group A streptococcal bacterial strep throat

More painful, with fever, a whitish coating, and tender lymph nodes. The diagnosis of strep throat is based on a rapid strep test (TROD) performed by a doctor or pharmacist; without evidence of Group A streptococcus, antibiotics are not recommended for adults.

A single swollen tonsil

Several mechanisms are possible. The infection may remain localised to a single tonsil. It can also progress to peritonsillar cellulitis or an abscess (phlegmon) with severe pain, trismus (inability to open the mouth), a “hoarse” voice, and deviation of the uvula: this is an ENT emergency. Other, rarer causes include tonsillar stones (tonsilloliths), residual unilateral hypertrophy, or, exceptionally, a tumour. Medical consultation is recommended if the asymmetry persists outside of an acute episode or is accompanied by warning signs.

Here are the main symptoms associated with swollen tonsils:

• Sore throat and pain when swallowing. The pain may radiate to the ear on the same side in cases of unilateral tonsil swelling (referred pain).

• Fever and general malaise. Common in bacterial infections; mild or absent in viral infections.

• Whitish coating or whitish spots on the tonsils. Nonspecific sign: possible in both viral and bacterial cases; the rapid strep test (TROD) is definitive for Group A streptococcus.

• Tender cervical lymph nodes. Often associated with tonsillar inflammation.

• Hoarse voice, difficulty opening the mouth, excessive salivation, deviation of the uvula. These signs suggest peritonsillar abscess and require urgent evaluation.

• Foul-smelling breath, sensation of a foreign body. This may suggest a tonsillar stone or calculus. A medical evaluation can confirm the diagnosis and rule out other causes.

The approach focuses on relieving symptoms and, if necessary, on targeted treatment when the cause is bacterial. For pain and fever, paracetamol is the preferred choice in cases of infection. NSAIDs (ibuprofen, ketoprofen) carry a risk of worsening certain ENT infections; they are not recommended as a first-line treatment if an infection is suspected.

Hydration, rest, warm or cold drinks depending on personal preference, and a bland, low-acid diet contribute to overall well-being.

In cases of severe pain or confirmed strep throat, a healthcare professional may recommend a rapid antigen test to determine whether to prescribe antibiotics only if Group A streptococcus is confirmed.

Dietary supplements are not intended to prevent, treat, or cure any disease. They should be used as a complement to lifestyle and dietary measures, following the dosages indicated on the label and avoiding any contraindications. Nevertheless, they can provide relief:

Propolis Extract

Aroma-Zone’s organic brown propolis hydroglycerin extract is a liquid dietary supplement that is alcohol-free, sugar-free, and preservative-free, with a guaranteed polyphenol content of 12 mg per milliliter. Produced using a gentle extraction process, it concentrates all of propolis’s active compounds while removing insoluble resins. Water-soluble and naturally pleasant-tasting, it offers support during seasonal changes and is easy to dose using its pipette.

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Organic Throat-Soothing Lozenges

Aroma-Zone Organic Soothing Throat Lozenges (45 g) are a French dietary supplement formulated with certified organic acacia gum and honey. They are enriched with lemon and peppermint essential oils, marshmallow extract rich in soothing mucilage, and a propolis extract concentrated in polyphenols. Designed to be slowly dissolved in the mouth, they aim to relieve tingling and irritation at the first signs, without resorting to unnecessary or controversial additives.

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Some home remedies can help relieve discomfort:

• Gargling with warm salt water, 2 to 3 times a day. Temporary relief. Do not swallow.

• Mild hot beverages: Hot water with lemon and honey, thyme or sage herbal teas, depending on preference. Honey should not be given to children under one year of age.

• Vocal rest and humid environment: Limit irritants (tobacco), humidify the air, take lukewarm showers.

• Comfort foods: Warm soups, yoghurt, popsicles if the coolness soothes the pain.

Here is a suggested routine during the painful episode: 

1. Morning: Assess the discomfort. If the tonsils are swollen with a mild fever and no warning signs, take acetaminophen at the usual dose and stay hydrated.

2. Late morning: Hot or cold drinks as preferred; possibly a saltwater gargle. A light snack.

3. Afternoon: If significant pain persists, consult a pharmacist; a rapid antigen test (TROD) may be offered to guide treatment.

4. Evening : vocal rest, continued hydration; continue pain relief as needed.

5. At any time: In case of a hoarse voice, trismus, deviation of the epiglottis, rapid worsening, or a swollen tonsil on one side with severe pain, seek emergency care.

A swollen tonsil accompanied by a persistent high fever, difficulty opening the mouth, a "hoarse" voice, or a deviation of the uvula requires prompt medical attention. In cases of infection, use paracetamol for pain and fever; avoid self-medicating with NSAIDs without consulting a doctor.

When faced with a swollen tonsil, it's most useful to work out which situation you're dealing with: a likely viral case with mild pain, a clearer picture that needs a rapid strep test to decide on antibiotics, or warning signs that call for urgent evaluation straight away. Simple measures, staying hydrated, resting your voice, choosing suitable drinks, and taking an appropriate painkiller, can effectively ease the discomfort. Food supplements can support throat comfort, in line with relevant regulations and contraindications. It's recommended to monitor symptoms over 48 to 72 hours and check in with a healthcare professional if in doubt.

Stéphanie is a pharmacist (since 2010) and holds a PhD in molecular biology (since 2012). Passionate about writing, she has produced medical content for nearly 15 years. Her goal is to make information accessible and easy to understand, without ever sacrificing scientific accuracy.