Sudden fainting in the elderly is clinically considered as syncope if it is accompanied by loss of consciousness. Syncope in the elderly is first considered to be caused by cardiac diseases, such as premature cardiac contractions or myocardial ischemia, resulting in interruption of the blood supply to the heart, and the patient suffers a transient loss of consciousness, and there are also cases of fainting in the elderly accompanied by loss of consciousness. It can also be cerebrovascular disease, especially the blood supply of the posterior circulation vessels is suddenly interrupted, the patient can appear loss of consciousness, mainly when the patient suddenly twisted his head, consider affecting the blood supply of the vertebral artery, if necessary, to carry out intracranial vascular ultrasound examination. If the elderly fainted, not accompanied by loss of consciousness, can be seen in many diseases, such as the elderly anemia, can appear dizziness, weakness, can appear fainting, the elderly low blood sugar can also appear weakness, fainting, can also be accompanied by panic, sweating, etc., mainly depends on the patient’s accompanying symptoms.