Chemotherapy nosebleed on the one hand may be due to chemotherapeutic drugs bone marrow suppression, on the other hand may be due to the dryness of the nasal mucosa. 1. Nosebleed caused by bone marrow suppression of chemotherapeutic drugs. The use of chemotherapeutic drugs to inhibit tumor cells also has a certain effect on the hematopoietic function of bone marrow, resulting in a decrease in the number of platelets and deterioration of hemostatic ability. Under the action of external force, it will lead to bleeding of nasal mucosa, and its hemostatic time becomes longer. 2. Nasal bleeding caused by dry nasal mucosa. Certain chemotherapeutic drugs may have certain damage to the nasal mucosa, plus the dry climate and other reasons, which may also cause the nasal mucosa to bleed after external stimulation. If the bleeding cannot be stopped effectively after chemotherapy, you should go to the hospital in time to find out the cause and do not delay the condition.