30-year-old man always nosebleed, can consider the occurrence of nasal septum deviation, leukemia or nasal capillary hemangioma and other diseases. 1. Deviated nasal septum: Adults with deviated nasal septum can be caused by nasal trauma resulting in nasal septum fracture, dislocation or nasal cavity occupying lesions that increase the size of the nasal septum due to compression, because of the deviated nasal septum convex surface, bone spine or bone ridge at the top of the mucous membrane is relatively thin, in the airflow or dust and other stimuli, the mucous membrane can be eroded, which is always a manifestation of nosebleed. 2. Leukemia: Adults can have blood system diseases – leukemia due to many reasons, such as abnormal immune function, viral infection, ionizing radiation, etc. In the case of thrombocytopenia or coagulation factor reduction, if there is infection in the nasal cavity, there can be nosebleeds. 3. Nasal capillary hemangioma: when there is capillary hemangioma in nasal cavity, because it is composed of most of well-differentiated capillaries, so the color is bright red or dark red, the hemangioma is soft in texture, and there can be repeated episodes of nosebleed, the amount of which is variable. Adults always have nosebleeds, it is recommended to go to the hospital specialist in time, after identifying the cause of the disease, to the cause, symptomatic treatment.