Hematology is a branch of medicine that deals with the study of blood and its disorders. It studies blood cancers like lymphoma, leukemia and myeloma as well as blood clotting disorders like hemophilia. The document lists common causes of blood disorders such as genetic factors, immune system issues, drug and alcohol intake, smoking, and nutritional deficiencies. It also describes symptoms of blood disorders which can include shortness of breath, weakness, nose bleeds and fast heart rate. Finally, it outlines some treatment options for blood disorders such as chemotherapy, antibiotics, supplements, blood transfusions and medical scans.