The causes of nosebleeds in the morning include local factors and systemic factors. 1. Local factors (1) Deviated nasal septum: the mucous membrane at the deviated place is thin, the surface mucus is less and the mucous membrane is dry and cracked, so it ruptures and bleeds. (2) Nasal tumors: such as capillary hemangioma of nasal septum and inferior turbinate, nasopharyngeal fibrous hemangioma and so on. (3) Rhinitis and special infectious diseases of nasal cavity: acute and chronic rhinitis, tuberculosis, leprosy and syphilis, etc., which cause bleeding due to mucous membrane erosion and ulceration. (4) Nasal foreign body: common in children. (5) Pharyngeal tonsil hypertrophy: mostly caused by secondary inflammation and congestion of nasal mucosa. (6) Metabolic reaction: repeated nosebleeds may be related to metabolic reaction. 2. Systemic causes (1) Diseases of heart and circulatory system: such as hypertension, mitral stenosis and so on. (2) Bleeding disorders: various types of leukemia, hemophilia, pernicious anemia, etc. are prone to nosebleed. (3) Nutritional disorders or vitamin deficiencies: lack of vitamin C, K, B, P and calcium in the blood is prone to bleeding. (4) Liver and kidney diseases: because liver disease can affect the formation of thromboplastin, uremia is easy to cause damage to small blood vessels. (5) Poisoning: many chemicals such as phosphorus, mercury, monument, benzene, etc., can destroy the function of hematopoietic system. (6) Endocrine disorders: female menstruation, menopause can occur nosebleeds. (7) Hereditary hemorrhagic capillary dilatation disease: it is easy to have repeated nosebleeds. Patients with nosebleeds should go to the hospital in time to find out the cause and standardize the treatment under the doctor’s guidance.