What are the possible reasons for asymmetric neck swelling?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Asymmetric neck swelling—when one side of the neck appears more swollen than the other—can result from several conditions, including Kimura's disease (a rare chronic inflammatory disorder), submandibular gland swelling (often due to stones or infection), and unilateral tonsillar enlargement (which may indicate infection or, less commonly, tumor).

Because the causes range from benign to serious, identifying the underlying issue early matters. If you're noticing uneven swelling in your neck, don't guess—take a free, instant, online symptom check to better understand possible causes tailored to your specific symptoms and get clear guidance on your next steps.

Reviewed for medical accuracy: 07/20/2026

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Explanation

Asymmetric neck swelling can be due to different medical conditions, each with its own characteristics.

Kimura's Disease: This is a rare condition that can cause swelling in the neck. It is often identified using imaging techniques like MRI, which can show specific changes in the tissues.
Submandibular Swelling: This type of swelling occurs under the jaw and can have various causes. It is important to consider different possibilities when diagnosing this type of swelling.
Unilateral Tonsillar Enlargement: Sometimes, one tonsil can become larger than the other. This can be linked to different health issues and needs to be evaluated carefully.

Each of these conditions requires proper medical evaluation to determine the exact cause and appropriate treatment. If you notice unusual swelling in your neck, you can start by using a free AI symptom checker to better understand your symptoms, then consult a healthcare professional for an accurate diagnosis and guidance.

(References)

Oguz KK, Ozturk A, & Cila A. (2004). Magnetic resonance imaging findings in Kimura's disease. Neuroradiology, 15289957.
Eleftheriadis I, Papadimitriou P, & Tzelepi H. (1990). [Submandibular swelling and its differential diagnosis]. To Helleniko periodiko gia stomatike & gnathoprosopike cheirourgike, 2130058.
Guimarães AC, de Carvalho GM, Correa CR, & Gusmão RJ. (2015). Association between unilateral tonsillar enlargement and .... Critical reviews in oncology/hematology, 25487766.

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