Nosebleeds can be caused by local diseases of nasal cavity, such as trauma, mucosal inflammation, erosion, tumor, etc., and can also be manifestations of systemic diseases of nasal cavity, such as abnormal liver function, hematological diseases, hypertension, arteriosclerosis, etc. Severe nosebleed with sharp vision loss after head injury may come from sphenoid bone fracture leading to rupture of intracranial pseudoaneurysm. Insufficient nutrition intake caused by unhealthy eating habits such as partial eclipse is often the cause of nosebleeds in children.

A small amount of nosebleeds every day are mostly caused by local inflammation of nasal mucosa. Erythromycin, chlortetracycline and other ointments can be applied to the nasal cavity, which has anti-inflammatory and protective effects on the nasal mucosa. A small amount of bleeding can also be achieved by pressing the alar, that is, pinching the alar on both sides with fingers (aiming at pressing the anterior lower part of the nasal septum) 10 ~ 15 min, and applying cold water on the forehead and back neck at the same time to promote vasoconstriction and reduce bleeding.