My sister has hodgkin's disease. What does this mean?

A blood disorder. Sorry to hear that. Your sister has been diagnosed with a type of cancer that affects the white blood cells. It is very curable with proper treatment including chemotherapy and possibly radiation therapy. Best of luck to your sister.
Hodgkin lymphoma. It is a cancer of lymphatic organ. It accounts approximately 10r% of lymphoma.Diagnosis is usually made by doing a biopsy on the affected site- usually lymph node biopsy. It is treatable and highly curable disease. The treatment will include chemotherapy and radiation therapy. Get more info at www.Nccn.Com for patient resource.