There are many reasons for nosebleeds, but about half of them can't be found. The tiny blood vessels in nasal mucosa are densely distributed, sensitive and fragile, and easy to rupture and bleed.

There are many reasons for nosebleed, such as nasal trauma, scab on mucous membrane, acid-base foreign body damage, overheating in the sun, excessive drinking and so on. Frequent nosebleeds are complications of cardiovascular system, internal organs, various infections, blood diseases and other diseases.

A child's nosebleed is usually a sign of influenza and acute respiratory diseases. If purulent discharge of nose precedes epistaxis, then foreign body may be the main cause. At this time, it can only be removed by a doctor.