Hodgkin lymphoma is a type of cancer that causes cells in the lymphatic system to abnormally reproduce, eventually making the body less able to fight infection. It is the most common cancer in people ages 15 to 19 and also one of the most treatable.
Hodgkin lymphoma usually begins in the lymph nodes of one part of a child's body, usually the head, neck, or chest and then tends to spread from one part of the lymphatic system to the next. In advanced stages, the disease can spread to the lungs, liver, bones, bone marrow, or other organs.