Occasional nasal bleeding is not a symptom of a serious illness, but frequent nasal bleeding can be a sign of a bleeding disorder, tumor, high blood pressure or other illnesses, according to MedlinePlus. Nosebleeds can be caused by colds and irritations, and they occur more often in the colder months.
Nasal bleeding frequently occurs in just one nostril instead of both of them. It is important to seek emergency medical attention if the bleeding continues for longer than 20 minutes or if the nasal bleeding began after a head injury. Individuals should contact their primary health care provider if they suffer from repeated nosebleeds and if the nosebleeds are not caused by irritants or colds.