The causes of fainting are as follows: First, syncope, syncope is mainly caused by people standing for too long, causing low blood pressure resulting in transient ischemia and insufficient blood supply to the brain, which leads to fainting and fainting, mostly seen in women, and patients with a weaker constitution. Second, cerebrovascular diseases, such as cerebral insufficiency, cerebral atherosclerosis, transient ischemic attack, and acute cerebral infarction, cerebral hemorrhage, can cause fainting. Third, other physical diseases, such as heart disease, heart failure, arrhythmia, and lung infection, chronic obstructive pulmonary disease, these diseases indirectly lead to cerebral ischemia, hypoxia, which leads to fainting.