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A lymph node, a part of the body that recognizes infections, is enlarged or swollen if it is more than 1 centimeter wide, according to MedlinePlus. Swollen lymph nodes can have many causes and subsequent treatments but usually stop being sore within a few days.


Enlarged lymph nodes, which are clusters of lymph tissue that contain immune cells, in the lungs can be caused by both common and uncommon infections, immune system disorders, or cancer, according to Mayo Clinic.


Causes of enlarged abdominal lymph nodes include infections in the abdomen, lymphoma, sarcoidosis and AIDS, according to Cleveland Clinic. Abdominal lymph nodes swell when the number of white blood cells inside them increase as a response to illness or infection.


Lymph nodes are tiny structures that help the body filter harmful and unhealthy substances, especially those that lead to infection. Cancer.org explains that each lymph node is packed with immune cells that help the body fight off infections by attacking germs carried t...


A bacterial or viral infection can cause preauricular lymph node enlargement. These lymph nodes are located directly in front of the ears.


According to About.com, the major functions of lymph nodes are to assist the body's immune system and to filter lymph. About.com explains that these masses of tissue and other lymphatic organs are essential in preventing the buildup of fluid in tissues, protecting the b...


There are hundreds of lymph nodes throughout the human body, mainly located in the head and neck region according to Mayo Clinic. However, lymph nodes are also found in the arms, legs, abdomen and groin area of the body.