If fainting occurs after exercise, it is generally considered that it may be caused by a variety of reasons, such as hypoglycemia, postural hypotension, cerebrovascular disease, epileptic disorientation seizure, heart disease, subarachnoid aneurysm, etc. 1, hypoglycemia: a large number of sports will consume body sugar, if the supplement is not timely, it will cause the occurrence of hypoglycemia; and the central nerve cells of the brain mainly use glucose as the basic energy, when the brain When the brain is not replenished with glucose, fainting may occur; 2, postural hypotension: the human body in strenuous exercise, there is a sudden change of position, if the vascular regulation is weak, blood will pool in the lower extremities, prone to transient postural hypotension and lead to fainting; 3, cerebrovascular disease: after exercise is likely to lead to a reduction or interruption of the blood supply to the brain tissue, resulting in transient Fainting, generally after the recovery of blood supply to the brain, the person will wake up; 4, epileptic disorientation seizures: because of the excitement of the brain due to exercise, will trigger the abnormal discharge of neurons in the brain, resulting in a short period of post-exercise fainting, this situation is mostly seen in patients with a history of epilepsy; 5, heart disease: for patients who have heart disease, the increase in heart rate after exercise will aggravate the ischemia of the heart or induce arrhythmia, so that the heart ejection is reduced or Interruption, resulting in fainting; 6, subarachnoid aneurysm: after exercise, due to increased blood pressure, may cause the rupture of the aneurysm, resulting in subarachnoid hemorrhage, resulting in fainting. When exercising, it is important to replenish sugar and water in a timely manner, not to exercise excessively for a long time, and to pay attention to rest in the middle of the exercise; to have regular medical checkups at hospitals to exclude post-exercise syncope caused by other diseases.