How long a 45-year-old patient with cerebral infarction lives is related to the individual’s past medical history, physical condition and the severity of the cerebral infarction. The prognosis of patients with cerebral infarction is related to the site of cerebral infarction, whether it affects the corresponding functional area, the size of the infarct, the patient’s vascular condition, and whether the patient has a history of hypertension, diabetes, coronary heart disease, atrial fibrillation, smoking and alcohol consumption, and other risk factors. Generally speaking, lacunar cerebral infarction with very small area, cerebral infarction in which the patient does not have severe stenosis of large blood vessels, and cerebral infarction in which the patient has few risk factors and mild symptoms, the patient may have only mild symptoms such as distorted mouth and tongue, hemianopia and unfavorable speech, which usually do not affect life expectancy. If there are sequelae, the quality of life will be lower than before, but it will not affect the life expectancy as long as the preventive treatment is adhered to without recurrence. If the patient has a large cerebral infarct, the symptoms are progressively aggravated, the patient is comatose or the respiratory and circulatory center of the medulla oblongata is affected, the patient’s risk of death will be increased. In addition, cerebral infarction itself does not necessarily lead directly to the patient’s death; if the patient has severe hemiplegia requiring long-term bed rest, he may endanger his life due to complications such as pulmonary infections, urinary tract infections, and decubitus ulcers; therefore, comprehensive treatment and care of patients with severe cerebral infarction is very important and is the key to reducing death. In conclusion, the life expectancy of patients with cerebral infarction cannot be generalized. Most of the patients with mild cases and most of the patients with severe cases will not have their life expectancy affected after effective treatment, as long as they take the corresponding drugs as prescribed by the doctors, control the risk factors and maintain a good state of mind.