A small amount of bone marrow extraction is normally harmless, but if a large amount of bone marrow is extracted there will be harm such as insufficient blood supply. 1. Bone marrow is the blood-forming tissue of the human body and has the ability of self-renewal. When a small amount of bone marrow is extracted for the purpose of diagnosis of blood system diseases and other condition specifications, although there will be a sense of pain, it will not cause harm to the human body. 2. However, if a large amount of bone marrow is extracted, it may lead to insufficient blood supply, sternal pain, and decreased immunity. In addition, if the patient himself has a disorder of blood clotting mechanism, the traumatized area will not be easy to heal after the extraction of bone marrow, and infections will easily occur. Bone marrow extraction should be carried out in regular hospitals, and after the extraction of bone marrow, attention should be paid to supplementing nutrition, more rest, and once there is any discomfort, consult the doctor in a timely manner.