There are many types of cerebral infarction, and the commonly used type is TOAST type. TOAST type is based on the etiology and mechanism of the disease, and cerebral infarction can be divided into 5 major types: 1. Atherosclerosis of large arteries, where stenosis and plaque occur in large intracranial and extracranial vessels, and stenosis reaches 50% or more, resulting in low perfusion infarction or plaque dislodgement causing embolism, which are all atherosclerotic cerebral infarction. This is the most common type of cardiogenic infarction. 2. cardiogenic embolism type, the most common is the occurrence of atrial fibrillation in the heart, after atrial fibrillation, blood stagnation in the heart does not flow, resulting in blood clotting easily to form an embolus, which is dislodged and enters the brain along the blood vessels, causing cerebral infarction, which is the most common type of cardiogenic infarction. 3. small artery occlusion type, the most common problem of small arteries is lacunar cerebral infarction, because the blood vessels This is a small lesion less than 1.5 cm in diameter, which is lacunar cerebral infarction. 4. Next are other etiologies, which have more causes, such as cerebral infarction caused by hereditary diseases, for example, CADASIL, which is a common hereditary cerebrovascular disease, can appear as subcortical infarction, and it is an autosomal dominant genetic disease. There is also the common infarction caused by carotid artery entrapment after exercise in young people. There is also coagulation abnormality, which is caused by taking certain drugs or imbalance of coagulation factors in the body, resulting in a hypercoagulable state of blood, which can also cause cerebral infarction, and there are many reasons for this. 5. There is also a large category of unexplained cerebral infarction, which is classified as unexplained cerebral infarction after various tests are done, but the exact cause still cannot be found.