Hodgkin's disease (or Hodgkin’s lymphoma) is a cancer of the lymphatic system. The lymphatic system drains excess fluid from the blood and protects against infection. Cancer occurs when cells in the body (in this case a type of white blood cell called lymphocyte) divide without control or order. If cells keep dividing uncontrollably when new cells are not needed, a mass of tissue forms, called a growth or tumor.
Hodgkin's disease is different from other forms of lymphoma
. Hodgkin's disease is one of two common types of cancers of the lymphatic system. The other type, non-Hodgkin's disease
, is far more common.