What could cause asymmetrical swelling in the throat?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Asymmetrical throat swelling can result from several conditions, ranging from common to serious. Possible causes include:

Tonsil enlargement (unilateral tonsillitis or peritonsillar abscess)
Lymph node swelling from infection
Benign growths such as cysts or polyps
Tumors, including tonsil or throat cancer

Because uneven swelling on one side of the throat can occasionally signal a serious underlying issue, prompt medical evaluation is essential. A healthcare provider can perform an exam, imaging, or biopsy if needed to determine the cause and guide treatment.

Not sure whether your symptoms warrant an urgent visit? Understanding what may be behind your swelling is the first step toward peace of mind and proper care. Take a free, instant, online symptom check to help identify possible causes and clarify your next steps—so you can make informed decisions about your health quickly and confidently.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Discover causes of asymmetrical throat swelling Learn if throat swelling needs care now Find out if it could be serious See OTC relief for throat swelling Find throat specialists near you Discover home remedies for throat swelling Check symptoms for likely throat swelling causes

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Explanation

Asymmetrical swelling in the throat can have several causes. One common reason is the enlargement of one tonsil, which could be due to infection or inflammation. However, sometimes one tonsil can be larger than the other even when there is no pain or other symptoms.

In some cases, asymmetrical throat swelling can be a sign of something more serious, like cancer. For instance, a study found that a tonsil that looks normal but is larger than the other could sometimes mean there is a malignancy.

Here are some possible causes:

Infections: These can cause one tonsil to swell more than the other.
Tonsillar Hypertrophy: This is when one tonsil is naturally larger without any infection.
Malignancy: Rarely, cancer can cause one side of the throat to swell more than the other.

If you notice asymmetrical swelling in your throat, it is important to see a doctor to determine the cause and get the right treatment. You can start by using Ubie's free AI symptom checker to help identify what might be causing your symptoms and whether you should seek medical care.

(References)

Oluwasanmi AF, Wood SJ, Baldwin DL, & Sipaul F. (2006). Malignancy in asymmetrical but otherwise normal palatine .... Ear, nose, & throat journal, 17124938.
Cinar F. (2004). Significance of asymptomatic tonsil asymmetry. Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery, 15243564.
Ottinger AM, Singh R, Chen D, & Parham K. (2023). Unilateral Tonsillar Enlargement as Initial Presentation .... Ear, nose, & throat journal, 37997620.

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