Nosebleed in the morning may be caused by the dry environment, and also may be sinusitis, nasopharyngeal cancer, hypertension and other diseases. 1. Environmental dryness: due to the dry environment, the nasal mucosa is dry, the nasal secretion is reduced, the blood vessels are brittle, and the symptoms of nosebleed can appear. 2. Sinusitis: Sinusitis is a relatively common nasal disease, some patients with sinusitis may have morning nosebleed, the bleeding amount is not particularly large, but there may be repeated bleeding. 3. Nasopharyngeal cancer: Nasopharyngeal cancer patients are prone to nosebleed in the morning, the blood accumulates in the sinuses, and the change of body position after getting up upright leads to the outflow of bloody nasal secretion, so nosebleed is common in the morning. 4. Hypertension: hypertensive patients cause morning nosebleeds, mainly and long-term hypertension, resulting in increased brittleness of the nasal mucosa has a relationship. Nosebleed in the morning may also be caused by blood system diseases, vitamin deficiency, etc. Patients should go to the regular hospital in time to identify the cause of the disease, under the guidance of the doctor to clarify the diagnosis and treatment.