Sudden fainting in the elderly is clinically considered as syncope if the patient is accompanied by loss of consciousness. Syncope in the elderly is first considered to be caused by cardiogenic diseases, such as premature heartbeat or myocardial ischemia, which lead to interruption of blood supply to the heart, and the patient experiences transient loss of consciousness, as well as fainting in the elderly with loss of consciousness. It can also be cerebrovascular disease, especially sudden interruption of blood supply to the posterior circulation vessels, and the patient can experience loss of consciousness, mainly when the patient suddenly turns his head, which is considered to affect the blood supply to the vertebral artery, and if necessary, intracranial vascular ultrasound should be performed. If an elderly person faints without loss of consciousness, it can be seen in many diseases, such as anemia in the elderly, there can be dizziness and weakness around the body, and fainting can occur, and weakness and fainting can also occur in the elderly with hypoglycemia, and it can be accompanied by panic and sweating, etc. It mainly depends on the accompanying symptoms of the patient.