Lymph nodes are glands that store white blood cells. When the body experiences an infection, illness, or even stress, the lymph nodes swell as they create more cells to fight the problem. Swollen inguinal lymph nodes on either side of the groin may be a symptom of a variety of infections, as well as anal and other cancers. Swollen, hard, or immovable nodes that seem to be increasing in size can indicate cancer.

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