Hematology is a branch of medical science that deals with the cause treatment prognosis and prevention of diseases related to blood and blood forming organs It involves treating diseases that affect the production of blood and its components such as blood cells hemoglobin blood proteins bone marrow platelets blood vessels spleen and the mechanism of coagulation Such diseases might include hemophilia sickle cell anemia blood clots thrombus other bleeding disorders and blood cancers such as leukemia multiple myeloma and lymphoma