Some areas where lymph nodes commonly swell are in the neck, groin, and underarms. For instance, ear pain, fever, and enlarged lymph nodes near your ear are clues that you may have an ear infection or cold. Swollen lymph nodes (lymphadenopathy) tell you that something is not right, but other symptoms help pinpoint the problem. When there’s a problem, such as infection, injury, or cancer, lymph nodes in that area may swell or enlarge as they work to filter out the “bad” cells. Some lymph nodes are deep inside the body, such as between the lungs or around the bowel, to filter fluid in those areas. Fluid from the head, scalp, and face flows down through lymph nodes in the neck. This fluid may filter through lymph nodes at the elbow, or those under the arm. Lymph fluid from the fingers, for instance, works its way toward the chest, joining fluid from the arm. Each lymph node filters the fluid and substances picked up by the vessels that lead to it. There are hundreds of lymph nodes throughout the body.
They contain immune cells that can help fight infection by attacking and destroying germs that are carried in through the lymph fluid. Lymph nodes are located in many parts of the body, including the neck, armpit, chest, abdomen (belly), and groin. Lymph nodes are small structures that work as filters for foreign substances, such as cancer cells and infections. Lymph vessels send lymph fluid through nodes throughout the body. There, lymph fluid collects into a large vessel that drains into a blood vessel near the heart. Lymph vessels draw up the lymph fluid from around the cells to send it towards the chest. Lymph fluid would build up and cause swelling if it were not drained in some way.
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