Unilateral nosebleeds are not leukemia. Unilateral nosebleeds are most commonly seen clinically in the littoral zone of the mucosal surface of the nasal septum, where blood vessels in the arterial or venous plexus rupture and bleed, usually associated with dry nasal mucosa, improper nose digging, deviated nasal septum, etc. When unilateral nasal bleeding occurs, if the amount of bleeding is small, topical vitamin AD drops or Bevosol gel can be used, and the treatment course is usually one week. If the bleeding is more rapid, you need to go to the hospital for laser treatment of nasal bleeding or nasal cavity stuffing in time. Nasal bleeding caused by leukemia is usually bilateral, the bleeding volume is not large, and it is accompanied by bleeding gums or oral mucous membrane bleeding.