Cerebral hemorrhage is a non-traumatic cause of bleeding in the brain parenchyma, the acute phase of cerebral hemorrhage has a high mortality rate, so it is extremely important to understand the causes of cerebral hemorrhage and adopt targeted prevention and control measures. The most common causes of cerebral hemorrhage are: 1. The most important cause of cerebral hemorrhage is hypertension, the sclerosis of small arteries in the brain under the effect of long-term hypertension, the weakening of the elasticity of the walls of small arteries, and even the formation of microaneurysms, etc. When the blood pressure rises suddenly, the blood vessels are prone to rupture and bleeding. 2, other causes are less common than hypertension, including cerebral arteriovenous malformation, cerebral amyloid angiopathy, cerebral floor abnormal vascular network disease, cerebral arteritis, blood diseases, thrombolysis or anticoagulation therapy, etc., of which cerebrovascular malformation is a more common cause, but also one of the main causes of cerebral hemorrhage in young people, because the malformation of blood vessel travel is extremely irregular, and often have segmental expansion, elastic fiber discontinuity, smooth muscle Because of the extremely irregular travel of malformed blood vessels, and often have segmental dilatation, elastic fiber discontinuity, smooth muscle dysplasia and other lesions, so the malformed cerebral vessels are easy to break type bleeding. 3, thrombolysis or anticoagulation therapy is also one of the main causes of cerebral hemorrhage in patients with acute cerebral infarction. When patients with acute cerebral infarction undergo thrombolysis or anticoagulation therapy, due to the dissolution of the embolus of the blocked blood vessel, vascular recanalization, reperfusion of blood in the proximal vessels, necrosis of the distal vessels due to prolonged ischemia and hypoxia, destruction of the integrity of the vessel wall, coupled with the formation of collateral circulation and imperfect neovascularization, all are prone to rupture and bleeding, called hemorrhagic transformation. Therefore, there are many causes for the development of cerebral hemorrhage, among which the most common and most important cause is hypertension. In the treatment process of cerebral hemorrhage, the first thing is to distinguish the cause of the disease in order to carry out targeted treatment and prevention.