Study of blood, blood-forming organs and blood diseases will come under HematologyHematology includes the treatment of blood disorders and malignancies, including types of hemophilialeukemia, lymphoma and sickle-cell anemia. Hematology is a branch of internal medicine that deals with the physiology, pathology, etiology, diagnosis, treatment, prognosis and prevention of blood-related disorders. Hematologists focus largely on lymphatic organs and bone marrow and may diagnose blood count irregularities or platelet irregularities.