Bone marrow suppression is a decrease in the activity of hematopoietic stem cells and various precursor cells in the bone marrow. The white blood cells and red blood cells flowing in the blood all originate from the hematopoietic stem cells in the bone marrow, but the length of life is different. The life span of white blood cells is only 6-8 hours and that of red blood cells is 120 days. In order to achieve timely replenishment, they must divide rapidly as hematopoietic stem cells. Chemotherapy and radiation, as well as other anti-tumor treatments, target rapidly dividing cells and thus often result in suppression of normal bone marrow hematopoiesis. Bone marrow suppression is a common side effect of most chemotherapy drugs, and most chemotherapy drugs can cause varying degrees of bone marrow suppression, which reduces the number of peripheral blood cells. Blood cells are composed of multiple cellular components, each of which plays an indispensable role for the body. A decrease in any one component will cause the body to experience the corresponding side effects. Common chemotherapy drugs include adriamycin, erythromycin, vincristine, and vincristine.