![]() ![]() The most common cause of swollen lymph nodes is an infection, particularly a viral infection, such as the common cold. The site of the swollen lymph nodes may help identify the underlying cause. You may be more likely to notice swelling in certain areas, such as in the lymph nodes in your neck, under your chin, in your armpits and in your groin. Lymph nodes are located in groups, and each group drains a specific area of your body. These specialized cells filter your lymphatic fluid as it travels through your body and protect you by destroying invaders. Inside lymph nodes are a combination of different types of immune system cells. Lymph nodes are small, round or bean-shaped clusters of cells. Seek immediate medical care if you're having difficulty swallowing or breathing.
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