Sudden nosebleed may be too dry with the environment, dry rhinitis, nasal capillary hemangioma, etc., rather than what disease omen. 1. Dry environment: because of high temperature and dry environment, nasal mucus gland secretion is relatively insufficient, nasal environment continues to be dry, the mucous membrane is brittle rupture bleeding. 2. Dry rhinitis: chronic inflammation of the nasal mucosa, gland secretion is reduced, the mucosa is slightly pale, dry, sticky secretion or thin crust attached to the front of the nasal cavity, and the mucous membrane of the anterior part of the nasal septum appears to be vesiculation, superficial ulceration, prone to rhinorrhea. 3. Nasal capillary hemangioma: it is often a polypoid with a tip, with smooth surface or forming ulcers, easy to bleed. Examination can be seen in the nasal septum in front of the lower part of the nasal cavity, or in the bottom of the nasal cavity and nasal turbinate found with a small tip or a wide base of new organisms, often dark red, smooth surface or mulberry-like, probe touch easy to cause severe bleeding. It is recommended not to always pick the nose, and often nosebleeds need to pay attention to, go to the hospital in time for a systematic examination of a clear diagnosis.