People often faint, may be related to postural hypotension, hypoglycemia, brain lesions, cardiogenic diseases and other reasons. 1. Postural hypotension: commonly found in the elderly or people who are physically weak, in a long time to keep squatting, lying down state, if you suddenly get up quickly, it is easy to induce postural hypotension, resulting in insufficient cerebral perfusion, there may be frequent fainting. 2. Hypoglycemia: Commonly found in diabetic patients, if the blood sugar control is not good, hypoglycemia may occur frequently. When hypoglycemia occurs, the whole body tissues and organs do not get enough energy supply, resulting in lack of oxygen to the brain, which may cause frequent fainting, and may be accompanied by panic, hand tremor and other symptoms. 3. Brain lesions: commonly seen in transient ischemic attack, posterior circulation ischemia and other diseases, due to sudden ischemia or obstruction of local brain tissues, resulting in impaired blood circulation in the brain, leading to cerebral ischemia and hypoxia, which may cause frequent fainting, and may be accompanied by headache, weakness and other manifestations. 4. Diseases of cardiac origin, more common is arrhythmia, such as patients with sinus bradycardia and atrioventricular block affect the blood supply of the heart, and then there is a reduction or interruption of the blood supply to the brain, resulting in fainting. Fainting can be related to a variety of factors, and it is recommended that you seek medical attention as soon as possible to diagnose the cause of your fainting by completing the relevant examinations, and then give targeted treatment.