When a woman is menstruating, nose bleeding may be caused by dryness of nasal mucosa, endometriosis lesions in the nasal cavity, etc., which need to be analyzed specifically. 1. Dryness of nasal mucosa: If the ambient temperature is too high and women drink less water during menstruation, the nasal mucosa becomes dry, which may cause capillary rupture and lead to bleeding. 2. Endometriosis foci in the nasal cavity: some patients suffer from endometriosis, and the ectopic endometrium will also bleed during menstruation, which may lead to nosebleed if the foci are at the nose. The bleeding is regular and occurs almost every month. There may also be other reasons for nose bleeding when a woman is menstruating. It is recommended that when this occurs, she should go to the hospital in time to improve the relevant examinations, clarify the cause under the guidance of the doctor, and carry out standardized treatment to promote the relief of discomfort.