Cerebral infarction, known as cerebral infarction and often referred to as ischemic stroke in modern medicine, is mainly a limited ischemic necrosis or softening of brain tissue caused by ischemia and hypoxia due to impaired blood supply to the brain. Cerebral thrombosis, lacunar infarction and cerebral embolism are common clinical types of cerebral infarction. According to relevant data, cerebral infarction accounts for 80% of all strokes, and its harm is self-evident. What symptoms should be alerted to cerebral infarction when our body appears? According to clinical experience, patients with cerebral infarction usually have subjective symptoms and physical symptoms. The subjective symptoms are headache, nausea, vomiting, aphasia, blurred vision, coma, etc. The physical symptoms are limb weakness, hemiparesis, unsteady gait, and in severe cases, incontinence, etc. When the patient has the above two symptoms, it is necessary to be alert to cerebral infarction. When patients have the above two symptoms, they can go to the hospital for CT or MRI examination. CT can not only clearly see the specific location and size of cerebral infarction lesions, but also exclude cerebral hemorrhage; MRI can accurately examine the ischemic damage of the brain within 1 hour of ischemia, and almost all large infarcts can be shown by MRI after 6 hours of disease onset. In addition, patients can undergo some routine tests to confirm the diagnosis of the disease. Hemiplegia caused by cerebral infarction may be completely paralyzed in severe cases, and large cerebral infarction may even endanger the patient’s life. Cerebral infarction is not only a serious threat to human health and life safety, but also a heavy burden to patients, families and society. Therefore, for the sake of one’s own health and family happiness, patients must seek medical treatment as soon as possible. The treatment of cerebral infarction can be divided into acute stage and non-acute stage according to the different time. In the acute stage, thrombolytic therapy is usually given. The treatment of non-acute stage can take some anti-platelet drugs, aiming at preventing the reoccurrence of attacks. In addition, in daily life patients also need to develop good dietary habits and control the three highs. Cerebral infarction is a kind of disease with high morbidity and mortality rate, and many people in the clinic have consulted the doctor because of cerebral infarction, including children, the elderly, and teenagers, which shows that cerebral infarction involves a wide range of people. In addition, cerebral infarction is one of the symptoms of smog disease. As a rare disease, smog disease, children under 10 years old and adults around 40 years old are the main high prevalence of the population, children can be manifested as one side of the limb weakness, slurred speech, always crying, adults mostly manifested as dizziness, headache, nausea, memory loss, etc. Therefore, when someone in the family has the above mentioned symptoms, it is very important for the family to have a good understanding of the symptoms. Therefore, when someone in the family has the symptoms mentioned above, it is necessary to go to a regular professional smog disease hospital to do cerebral angiography in a timely manner, and if the diagnosis is smog disease, it is recommended to carry out joint vascular bypass surgery in a timely manner.