Waking up with a nosebleed may be due to dry rhinitis, atrophic rhinitis, abnormal coagulation mechanism and other reasons. 1. Dry rhinitis: this disease can cause the mucous membrane of the nasal cavity to become dry, and the brittleness of the blood vessels in the nose increases. Nosebleed will occur after waking up. 2. Atrophic rhinitis: the nasal mucosa and glands atrophy, nasal secretion is reduced, the nasal cavity crusts after the infection of stinky nose bacillus, and there can be nosebleeds after the crusts fall off after blowing the nose in the morning. 3. Coagulation disorders: in addition to nosebleeds, if there are other parts of the bleeding or ecchymosis symptoms, should also consider leukemia, platelet aplastic anemia and other coagulation disorders. Only according to the patient woke up nosebleed symptoms can not diagnose the specific type of disease, it is recommended to actively go to the regular hospital systematic examination to clarify the diagnosis.