Lymph nodes are normal structures whose function is to fight germs that enter the body. A lymph node is smaller than a pea and is not generally noticeable. When an infection or inflammation occurs, lymph nodes become painful, swell up and can be felt by touch in the neck, armpits and groins.
Infections are very common in children.
Lymph node swelling is more frequent in children than in adults. The swelling usually starts to diminish in size within a week or two. Certain infections lead to enlargement of the lymph nodes for several weeks. A lymph node can form an abscess in severe infection. Lymphadenopathy may also be a sign of cancer.