When you go to the hospital for a cranial CT scan, the report often says lacunar cerebral infarction. So what is lacunar cerebral infarction? Should it be treated? Lacunar cerebral infarction refers to the occlusion of small blood vessels in the brain (commonly atherosclerosis), resulting in necrosis due to ischemia and hypoxia of brain tissue in the corresponding blood supply area. In general, the area of brain tissue supplied by small blood vessels is very small, so the volume of necrotic brain tissue is also very small (its diameter usually does not exceed 1.5 cm), and its clinical symptoms are mostly mild, and some of them do not even feel anything. In individual cases, if lacunar cerebral infarction occurs in a brain region with important functions, it can also cause clinical manifestations such as hemiparesis, difficulty in speaking or swallowing, and numbness of limbs. When lacunar cerebral infarction is found, it is mostly accompanied by cardiovascular and cerebrovascular risk factors such as hypertension, hyperlipidemia, and diabetes mellitus. Therefore, the treatment should control the blood pressure, blood sugar and blood lipids within the appropriate range. We should also insist on diet control, regular exercise, weight control, smoking and alcohol cessation, and improvement of lifestyle. If there are clinical symptoms, treatment such as aspirin, statins, nerve nutrition, improvement of microcirculation, and anti-oxidative stress need to be given.