Bone marrow is the main blood-forming organ of the body, and it contains various blood-forming cells and stromal cells needed for blood production. Bone marrow diseases commonly include: a. Osteomyelitis, which refers to the inflammation of bone marrow caused by external bacterial infection, and the patient can show clinical manifestations such as severe bone pain and fever, requiring effective antibacterial medication. Bone marrow metastatic cancer refers to malignant tumors from other parts metastasizing to bone marrow through bloodstream, proliferating disorderly in the bone marrow cavity, causing painful swelling of bone marrow, and heaps of metastatic cancer cells can be found through bone marrow aspiration. Third, various common hematological diseases, such as aplastic anemia, acute leukemia, chronic leukemia, multiple myeloma, true erythroblastosis, primary thrombocythemia, myelofibrosis, etc.. All of these diseases are caused by lesions of bone marrow hematopoietic stem cells from various causes, and they all belong to the scope of bone marrow diseases.