There are many reasons for inexplicable nosebleeds, and if this happens, you should seek medical attention in time to do rhinoscopy and blood system examination to clarify the cause as soon as possible. 1. Environmental factors: dry or dusty environment may lead to dryness and damage to the nasal mucosa, which may cause the capillaries in the nasal cavity to rupture and bleed; 2. nasal snot, picking nose or nose hit by violent external force may lead to rupture and bleeding of capillaries in nasal mucosa; 3, nasal inflammation: nasal inflammation may lead to vasodilation of nasal mucosa, causing rupture and bleeding of capillaries, while the secretions produced may stimulate nasal mucosa, leading to nasal mucosa erosion causing nasal bleeding; 4, blood diseases: such as suffering from platelet reduction or abnormal coagulation function, there will be nasal mucosa tissue Weakness, if collision with the nasal cavity may lead to capillary bleeding and difficult to stop; 5, nasal tumors: such as nasopharyngeal cancer or rupture of the nasal hemangioma, erosion of surrounding tissues and blood vessels may appear bleeding, erosion symptoms, manifested as nosebleeds. Daily, you should drink more water, eat a light diet and try to avoid eating spicy and stimulating food. Ensure that the humidity of indoor air is appropriate, and humidifiers can be used appropriately. Maintain good personal habits and try not to pick your nose too hard with your hands.