Cerebral infarction is a cerebrovascular disease in which irreversible damage to brain tissue occurs due to various factors, resulting in ischemia and hypoxia in brain tissue. Patients with cerebral infarction usually have a low-density infarct foci on CT of the head 24 hours after the onset of the disease, but for large and severe infarcts, low-density foci may be seen on CT within a few hours after the onset of the disease. Nevertheless, it is crucial to go to the hospital for CT examination as soon as possible after the onset to exclude cerebral hemorrhage.