
Lymphoma is a type of cancer that affects the immune system of the body. Specifically, it affects the lymphocytes, a type of white blood cell. The lymphocytes are part of the immune system and help the body to fight infections. The cancerous lymphocytes grow uncontrollably and collect in different portions of the body; lymph node can be one of the most common sites for lymphoma development. The lymph nodes are found throughout the body particularly in the groin, neck, and under the arms. Lymphoma can also develop in the deeper lymph nodes such as those in bone marrow and spleen. Very rarely this disease can start in other parts of the body such as stomach, breast, skin, brain, bowel, or liver.