Any abnormal substance entering the cerebral arteries causing ischemia, hypoxia, and necrosis of brain tissue is called cerebral embolism. The causes of cerebral embolism mainly include the following types: The first type is cardiogenic cerebral embolism, which is caused by heart diseases. For example, the most common atrial fibrillation is the most common cause of cerebral embolism. Atrial fibrillation can lead to the formation of some mural thrombi. These thrombi form, detach, and enter the cerebral arteries causing embolism. Additionally, myocardial infarction is also an important cause, and patients with myocardial infarction can also form some abnormal thrombi in the heart. Second, other causes, such as air embolism. In patients with fractures, a large amount of fatty tissue enters the cerebral arteries, which can also cause cerebral arterial embolism. Moreover, some venous thrombi from the lower limbs can also form cerebral embolism. During childbirth, the entry of amniotic fluid into the brain can also cause cerebral embolism.