Hodgkin Lymphoma (Hodgkin's disease) is one of a number of blood malignancies that develop when the lymphocytes get out of control. Cancer cells begin to grow in the lymphatic system and follow the network of organs, nodes, and vessels throughout your body. So what is Hodgkin Lymphoma (Hodgkin's disease)? What Causes Hodgkin's Disease? The following article will provide necessary information about this malignant blood disease.