The differential diagnosis of cerebral infarction is mainly distinguished from the following three diseases: 1. Cerebral hemorrhage: large infarction or moderate amount of hemorrhage is sometimes not so good to distinguish, but generally speaking, cerebral infarction mostly develops in quiet, with relatively few cases of headache symptoms or impaired consciousness, and the disease can reach its peak in 1-2 days of development. Cerebral hemorrhage tends to develop in activity, with higher blood pressure and more cases accompanied by headache and impaired consciousness. Cerebral infarction and cerebral hemorrhage can be clearly diagnosed by head CT or MRI; 2. Cerebral embolism: both cerebral infarction and cerebral embolism are manifestations caused by interruption of cerebral blood flow. Usually, cerebral embolism involves the internal carotid artery system more often and has clear sources of emboli, such as cardiogenic emboli, fat embolism, and air embolism. The condition of cerebral infarction peaks in 1-2 days, while the condition of cerebral embolism is aggressive and usually peaks in a few minutes; 3. Chronic subdural hematoma caused by intracranial occupying lesion or intracranial trauma: intracranial occupying lesion is mostly chronic or subacute in origin, while cerebral infarction is acute in origin, which can also be clearly diagnosed by cranial MRI or CT.