Low head nosebleed may be due to nasal mucosa brittle, nasal sinus disease, may also be caused by blood system diseases. 1. Localized lesions of the nasal mucosa, usually due to localized erosion and ulceration of the mucosa in the nasal cavity, which in turn will bleed; and, when the head is bowed, the local blood pressure will be increased, resulting in capillary rupture and bleeding. 2. Nasal and sinus lesions, part of the population suffers from nasal or sinus inflammation and allergic diseases, such as dry rhinitis, etc., the nasal mucosa will lead to congestion, excessive swelling and edema, the nasal mucosa is fragile, and may bleed due to vasodilatation when bowing down, in addition, deviated nasal septum, nasal hemangioma, polyps, nasopharyngeal carcinoma and other diseases, may cause the symptoms. 3. Blood system diseases, abnormal coagulation function and abnormal platelet function caused by various reasons may also cause nosebleeds due to changes in body position. It is recommended to actively seek medical treatment at the onset of the disease, and make a clear diagnosis after systematic examination, and follow the doctor’s instructions to standardize the use of medication and treatment.