Lymphoma is cancer of the lymph tissue, which is part of your body’s immune system. It’s found in your lymph nodes, spleen, liver and bone marrow. The cancer begins in a type of disease-fighting white blood cell called a lymphocyte. Lymphoma causes normal lymphocytes to change into abnormal cancer cells and start to multiply, sometimes forming a mass (tumor).
There are 2 major categories of lymphoma: Hodgkins lymphoma and non-Hodgkins lymphoma. Treatment and survival rates for lymphoma improve year after year. Most people diagnosed with Hodgkins lymphoma have an excellent prognosis.