Cerebrovascular disease is usually divided into two categories: ischemic cerebrovascular disease and hemorrhagic cerebrovascular disease. I. Ischemic cerebrovascular diseases include: (1) transient ischemic attack (TIA, also known as mini-stroke or transient ischemic attack), the cause of which is related to cerebral atherosclerosis and is a dysfunction caused by transient, ischemic and focal damage to brain tissue. (2) Cerebral thrombosis, mostly caused by atherosclerosis, various arteritis, trauma and other physical factors, blood disorders caused by local lesions in the cerebral vessels formed by the clot blockage and the onset. (3) Cerebral embolism, which can be induced by emboli produced by various diseases entering the bloodstream and blocking the blood vessels in the brain. Clinically, heart disease is the most common cause; followed by fracture, or fat into the blood after trauma; worm eggs or bacterial infection; pneumothorax and other air into the blood, emboli formed by phlebitis and other factors, embolism caused by the cerebral vessels. Second, hemorrhagic cerebrovascular disease includes: (1) cerebral hemorrhage, refers to the rupture of blood vessels in the brain parenchyma bleeding, excluding traumatic cerebral hemorrhage. Mostly caused by hypertension, cerebral atherosclerosis, tumors, etc. (2) Subarachnoid hemorrhage, caused by the rupture and bleeding of blood vessels on the surface and base of the brain and the direct flow of blood into the subarachnoid space. Common causes include ruptured aneurysm, vascular malformation, hypertension, arteriosclerosis, blood disorders, etc. According to foreign statistical data, cerebrovascular disease is more common with ischemic, cerebral infarction accounts for 59.2% to 85%, cerebral hemorrhage is generally below 20% except in Japan. In our country, 280 cases of new complete strokes were investigated in 1984 in rural areas, subarachnoid hemorrhage accounted for 3.9%, cerebral hemorrhage accounted for 44.6%, cerebral thrombosis accounted for 46.4%, cerebral embolism accounted for 2.5%, and those who were difficult to be typed accounted for 2.9%. From the above data, we can see that the situation in China is different from that in foreign countries, although cerebral infarction is more common, the percentage of cerebral hemorrhage is 44.6%, which is obviously higher than that in foreign countries, and the reasons for this are yet to be further explored.