Hematologic diseases are diseases that originate in the hematopoietic system or affect the hematopoietic system with abnormal blood changes, characterized by anemia, hemorrhage, and fever. The hematopoietic system includes blood, bone marrow mononuclear a macrophage system and lymphoid tissue. All diseases involving the pathology and physiology of the hematopoietic system and with its main manifestation belong to the category of hematopoietic diseases. 1.Red blood cell diseases Iron deficiency anemia (IDA), megaloblastic anemia (MA), aplastic anemia (AA), thalassemia, autoimmune hemolytic anemia, paroxysmal sleep hemoglobinuria (PNH), acute blood loss anemia, chronic disease anemia; 2.White blood cell diseases Granulocyte deficiency, leukemia (AL), myelodysplastic syndrome (MDS), malignant lymphoma (NHL), malignant histiocytosis, multiple myeloma (MM), etc.; 3. Blood clotting disorders pure purpura, allergic purpura, idiopathic thrombocytopenic purpura (ITP), thrombotic thrombocytopenic purpura (TTP), thrombocytopenia, hemophilia, etc.; 4. Myeloproliferative disorders true erythropoietic disorder, primary thrombocytosis, primary myelofibrosis disorders, etc.