Lymphoma is a cancer of the lymphatic system. Hodgkin lymphoma, which used to be called Hodgkin’s disease, is 1 of many types of lymphoma. Lymphoma begins when healthy cells in the lymphatic system change and grow out of control. This uncontrolled growth may form a tumor, involve many parts of the lymphatic system, or spread to other parts of the body.
Hodgkin lymphoma most commonly affects lymph nodes in the neck or in the area between the lungs and behind the breastbone. It can also begin in groups of lymph nodes under an arm, in the groin, or in the abdomen or pelvis.
If Hodgkin lymphoma spreads, the most common locations where it spreads are the lung, spleen, liver, bone marrow, or bone. Hodgkin lymphoma can spread to other parts of the body, but this is unusual.