Recently, I have been asked by patients which diseases are managed by hematology. Here is a unified reply. Hematology Department: 1. Red blood cell diseases: iron deficiency anemia, megaloblastic anemia, aplastic anemia, hemolytic anemia, thalassemia, autoimmune hemolytic anemia, drug-related hemolytic anemia, paroxysmal sleep hemoglobinuria, acute hemorrhagic anemia, chronic disease anemia, hemochromatosis, etc.; 2. Leukocyte diseases: leukopenia, granulocyte deficiency, eosinophil hyperplasia, acute leukemia, chronic leukemia, myelodysplastic syndrome, malignant lymphoma (Hodgkin’s lymphoma, non-Hodgkin’s lymphoma), infectious mononucleosis, infectious lymphocytosis, phagocytic syndrome, multiple myeloma, etc.; 3, bleeding disorders: simple purpura, allergic purpura, immune thrombocytopenia, thrombotic thrombocytopenic purpura, platelet anemia, hemophilia, acquired coagulation disorders, etc.; 4, myeloproliferative disorders: true erythropoietic disease, primary thrombocytosis, chronic idiopathic myelofibrosis. 5, blood deficiency, blood stasis, blood heat, blood cold, bleeding.