Hematology is the science or study of blood, blood-forming organs and blood diseases. In the medical field, hematology includes the treatment of blood disorders and malignancies, including types of hemophilia, leukemia, lymphoma and sickle-cell anemia. Hematology is practised by specialists in the field who deal with the diagnosis, treatment and overall management of people with blood disorders ranging from anemia to blood cancer. Some of the diseases treated by haematologists include Iron deficiency anaemia and other types of anemia such as sickle cell anemia or trauma-related anemia, Polycythemia or excess production of red blood cells, Myelofibrosis, Leukemia, Platelet and bleeding disorders such as hemophilia, idiopathic thrombocytopenic purpura and Von Willebrand disease, The myelodysplastic syndromes. Problems with the blood can impede many functions of the body and cause a range of complications. For this reason, hematology the study and treatment of blood disorders is a subspecialty of internal medicine. Hematologists work with blood-related conditions, including several types of cancer. They use a variety of tests and treatments for these issues. Many hematologists also receive training in oncology, which is the branch of medicine dedicated to diagnosing and treating cancer