Syncope is a transient disorder of consciousness caused by a transient cerebral ischemic attack, usually manifested as sudden confusion, and can return to normal after a few moments, the common causes of syncope are the following: 1, vasodilatory disorders, common such as vasovagal syncope, mostly seen in young women with weak constitution, often with precipitating factors, such as exertion, stress, fear, etc.; 2, cardiogenic syncope, this type of syncope is more serious. Commonly seen in severe cardiac arrhythmias, myocardial ischemia, etc.; 3, cerebral syncope, usually manifested as a transient ischemic attack, is the most common cause of syncope, frequent attacks suggest the possibility of cerebral infarction; 4, other more common causes of syncope are severe hypoglycemia, severe anemia, etc.