[Extraced from EHealthMD] Lymphoma is a cancer of the lymphatic system. The lymphatic system carries lymph fluid and white blood cells throughout body. The purpose of the lymphatic system is to fight infections. Like all cancers, lymphoma happens when the body's cells grow out of control, often causing tumors to grow. Most lymphomas are made up of white blood cells called either T cells or B cells. Lymphoma cells are sometimes found in the blood, but tend to form solid tumors in the lymph system or in organs. These tumors can often be felt as a painless lump or swollen gland almost anywhere in the body. About the Lymphatic System The lymphatic system helps to filter impurities, bacteria, and viruses from the body. The lymphatic system is made up of the lymph nodes [Small, bean-shaped organs located throughout the body along the vessels of the lymphatic system. The lymph nodes filter impurities from the body and store white blood cells that fight infection and other diseases. Cluste...