Cerebral infarction is an ischemic necrosis or softening of brain tissue caused by blood supply obstruction, ischemia and hypoxia in the brain. It is usually manifested by sudden fainting and unconsciousness, common distorted mouth and eyes, unfavorable language, hemiplegia, etc. Those who are prone to cerebral infarction are mostly middle-aged and old people. Cerebral infarction can be divided into four categories: 1. Cerebral thrombosis (thrombotic cerebral infarction) Cerebral thrombosis is the highest incidence of cerebral infarction, accounting for more than half of all cases of cerebral infarction, common among middle-aged and old people, and more men than women, mostly occurring in a quiet state, and in the early stage, there may be numbness of the limbs, weakness, headache, dizziness, etc., and within a few days, there may be half side of the limbs fail, aphasia, impaired consciousness, coma and so on, and the serious cases may cause death. In severe cases, it may cause death. Cerebral thrombosis is a disease caused by atherosclerosis of the cerebral arteries, which gradually narrows the inner lumen of the blood vessels or even completely occludes them. As a result of thrombus formation within the cerebral blood vessels, the local blood supply to the brain tissue is insufficient, further softening and necrosis. Symptoms vary depending on the location of the thrombus in the brain. Occipital lobe infarction may cause blurred vision; cerebellar infarction may cause dizziness, nausea and vomiting; thalamus infarction may cause fever, memory loss, emotional abnormality, etc., as well as sensory disorders, such as pain, chills, fever, and other abnormal sensations; brainstem infarction is more serious, most common in the cerebral pontine, mainly manifesting hemiparesis or quadriplegia, difficulty in swallowing and articulation, high fever, and even impaired consciousness (coma, mutism, etc.). The clinical symptoms of cerebral thrombosis and cerebral hemorrhage have many similarities, which are easy to be confused, but the treatment plans are opposite, and cranial CT and MRI are needed for further differential diagnosis. Cerebral embolism (embolic cerebral infarction) Cerebral embolism is the formation of “embolism” in other parts of the body (mostly blood vessels of the heart and limbs), such as blood clots, fat, air, and redundant organisms on the heart valves, etc., which enter the blood vessels and flow into the cerebral arterial vessels, blocking the lumen of the vessels, resulting in cerebral embolism, causing the cerebral tissues to become locally ischemic and softened, causing the same symptoms as cerebral thrombosis. Cerebral embolism is caused by ischemia and softening of the brain tissue, resulting in the same consequences as cerebral thrombosis, but its primary cause is not in the brain, and the etiology of the two is different. The incidence of cerebral embolism is also very high, and it is common in young and middle-aged people. It has a rapid onset, mostly without aura, and the symptoms are similar to those of cerebral thrombosis, such as headache, vomiting, confusion, hemiparesis, etc. For those who have a history of rheumatic heart disease, atrial fibrillation, subacute bacterial endocarditis, etc., the possibility of cerebral embolism should be considered. 3. Cavernous cerebral infarction is a small infarction caused by atherosclerosis and thrombosis of small arteries in the brain. Symptoms of this kind of patients are relatively mild, or there are only mild inattentiveness, memory loss, mild headache, dizziness, vertigo, and slow reaction, and so on. 4.Multiple cerebral infarction Multiple cerebral infarction refers to multiple ischemic soft infarction foci in the brain, in addition to common paralysis, sensory ability and language disorders, it also affects the brain function, leading to progressive intellectual decline, and finally leading to cerebrovascular dementia. It is common in middle-aged and elderly people, and hypertension as well as atherosclerosis are the main causes. The more foci the disease has, the higher the incidence and severity of dementia.