Non-Hodgkin lymphoma (NHL)

Non-Hodgkin lymphoma is a type of cancer that begins in the lymphatic system, which is part of the body’s immune system. The lymphatic system includes lymph nodes, lymph vessels, and organs such as the spleen, thymus, tonsils, adenoids, and bone marrow. It helps the body fight infections and other diseases. Non-Hodgkin lymphoma can develop in any part of the lymphatic system and may also spread to other organs in the body. There are many different forms of lymphoma, which are generally classified into two main groups: Hodgkin lymphoma and non-Hodgkin lymphoma. Non-Hodgkin lymphoma is the more common of the two. Most types of non-Hodgkin lymphoma begin in B lymphocytes (B cells) or T lymphocytes (T cells), which are white blood cells that play key roles in the immune response.