Lymphoma is a cancer of the lymphatic system, which consists of a network of vessels, organs, and glands throughout your body. Lymphomas are classified by the type of cell from which they develop.
The lymphatic system helps to protect humans from disease by carrying away waste products and foreign substances from the body. The lymphatic system includes the bone marrow, spleen, thymus gland, tonsils, adenoids, mucous membranes in the nose and throat, lymph nodes, and other tissues.
Lymphocytes (white blood cells) are produced in the bone marrow and travel through the bloodstream to reach other parts of the body. Lymphomas are cancers that begin in B-cells (white blood cells) or T-cells (a type of white blood cell). In general terms, lymphomas involve abnormal growths called tumors that start in one part of the body but spread to other parts through the lymphatic system or blood stream.