Hematology- Oncology is the branch of medicine related to the study of diagnosis, treatment, and prevention of blood diseases and cancer. It includes such diseases as iron deficiency anemia, hemophilia, sickle cell disease, the thalassemia, leukemias and lymphomas.The study of hematology integrates clinical and laboratory medicine. Leukemia affects your white blood cells. These are significant, infection-fighting part of your immune system, made in your bone marrow. The cancerous formation affecting the lymphocytes is called as lymphoma. Lymphocytes are one of the varieties of white blood corpuscles. As part of Myeloma, the plasma (another variety of WBC) is affected by the cancer cells. Blood cancers can cause many different symptoms. Some are common across all blood cancers, others are more characteristic of types of blood cancer. For example, lymphomas can be recognized by swollen lymph nodes and one of the most common symptoms of myeloma is bone pain, especially in the back.