Cerebral embolism refers to various abnormal emboli that enter the intracranial arteries with blood circulation, causing acute occlusion of the cerebral arteries and leading to ischemic hypoxic necrosis of the brain tissue in the supplied area. The onset is usually very sudden and dangerous, with patients rapidly developing limb paralysis, speech dysfunction, facial paralysis, and in some cases, coma, seizures, and other clinical manifestations. The most common source of embolism is the heart, such as atrial fibrillation or myocardial infarction forming mural thrombi that dislodge and enter the brain causing an embolism. Additionally, there are non-cardiac sources of embolism, such as the detachment of atherosclerotic plaques causing an embolism, as well as air embolisms and cancer cell embolisms. Cerebral embolism is an emergency and severe condition that requires prompt medical attention.