Adults with nosebleeds should be alert to nasal inflammation, nasal and pharyngeal tumors, nasal foreign bodies and other nasal diseases, as well as blood diseases. 1. Nasal inflammation: inflammatory stimulation of nasal cavity in allergy or cold. 2. Nasal and pharyngeal tumors: Tumors compress blood vessels and blood vessels rupture causing bleeding. 3. Nasal foreign body: the foreign body presses or punctures the blood vessel, and the blood vessel ruptures and causes bleeding. 4. Blood disease: In addition to the symptoms of nosebleed, if the skin is blue and purple, the gums bleed, the joints are swollen and painful, then blood disease should be considered. If an adult suffers from frequent nosebleeds and is accompanied by other uncomfortable symptoms, he or she should go to the hospital at the first time for early diagnosis and treatment.