Lymphoma is a cancer of the lymphatic system. This system - composed of lymph nodes in your neck, armpits, groin, chest, and abdomen - removes excess fluids from your body and produces immune cells. Abnormal lymphocytes, a type of white blood cell that fights infection, become lymphoma cells, which multiply and collect in your lymph nodes. Over time, these cancerous cells impair your immune system.

Types of lymphoma

Lymphomas are divided into two categories: Hodgkin lymphoma and non-Hodgkin lymphoma.

Both non-Hodgkin lymphoma and Hodgkin lymphoma affect white blood cells. The main difference is the presence of large, abnormal B white blood cells called Reed-Sternberg in people with Hodgkin lymphoma. Reed-Sternberg cells are a cancerous form of B cells.

Non-Hodgkin lymphoma can originate in either B cells or T cells. Both cancers get their name from the scientist who discovered them. Doctors can tell the two types apart by looking at cells under a microscope.

Click on a subtype to get more information on causes, symptoms, types, how its diagnosed, treatments, and other resources.

Hodgkin lymphoma

Non-Hodgkin lymphoma