Epistaxis, also known as epistaxis, is one of the common clinical symptoms. The manifestation of epistaxis varies depending on the cause, mostly unilateral, but also bilateral, intermittent and recurrent, or continuous. The symptoms and treatment methods of epistaxis are different for different causes. Therefore, if you want to treat epistaxis better, you must first understand the causes of epistaxis before you can proceed with further treatment. The main causes of epistaxis are as follows: 1. Blood disorders: ① Abnormalities in the quantity or quality of platelets. ② Abnormalities of the coagulation mechanism. 2. Acute infectious diseases. 3, cardiovascular diseases: ① high arterial pressure: such as hypertension, arteriosclerosis, nephritis, eclampsia with hypertension, etc. ② Increased venous pressure: such as mitral stenosis, huge masses in the chest or mediastinum and neck, emphysema, pulmonary edema and bronchopneumonia, etc. 4, vitamin deficiency: vitamin C, K, P and trace elements such as calcium deficiency, are prone to rhinorrhea. 5, chemical and drug poisoning: phosphorus, mercury, arsenic, benzene and other poisoning can destroy the function of the hematopoietic system and cause epistaxis. Long-term use of salicylic acid drugs can cause thrombinogen reduction and bleeding. 6, endocrine disorders: compensatory menstruation and precocious rhinorrhea often occur during puberty, mostly due to the reduction of estrogen content in blood and vasodilation of nasal mucosa.