According to the American College of Physicians: Hematology is the subspecialty of internal medicine concerned with disorders of the blood, bone marrow and lymphatic systems. These include anemias, disorders of white blood cells or platelets, aplastic anemia and other bone marrow failures, abnormal clotting and bleeding, Hodgkin’s disease and blood malignancies such as leukemia, lymphoma, multiple myeloma, hairy cell leukemia and related problems. Medical oncology is the subspecialty of internal medicine that focuses on treating cancer. There are two other types of clinical oncologists – surgical oncologists and radiation oncologists. In most cases, when a person is diagnosed with cancer, one of these oncologists takes charge of the patient’s overall care through all phases of the disease.