Lymph nodes are found throughout your body. They are an
important part of your immune system. Lymph nodes help your body
recognize and fight germs, infections, and other foreign
substances. The term "swollen glands" refers to enlargement of
one or more lymph nodes. In a child, a node is considered
enlarged if it is more than 1 centimeter (0.4 inch) wide. See
also: Lymphadenitis and lymphangitis Common areas where the
lymph nodes can be felt (with the fingers) include: Infections
are the most common cause of swollen lymph nodes. Infections
that can cause them include: Immune or autoimmune disorders that
can cause swollen lymph nodes are: Cancers that can cause
swollen lymph nodes include: However, many other cancers may
also cause this problem. Certain medications can cause swollen
lymph nodes, including: Which lymph nodes are swollen depends on
the cause and the body parts involved. Swollen lymph nodes that
appear suddenly and are pain are usually due to injury or
infection. Slow, painless swelling may be due