This document provides information about non-Hodgkin's lymphoma (NHL). It defines NHL as a group of blood cancers that includes all types of lymphomas except Hodgkin's lymphoma. Risk factors include older age, certain chemicals, viral infections like HIV and Epstein-Barr, and medications like immunosuppressants. Diagnosis involves tests of the lymph nodes, bone marrow, blood, and imaging scans. Treatment options include chemotherapy, bone marrow stimulants, and steroids.