Temporary loss of consciousness may be due to transient ischemia, epilepsy or vasovagal syncope. 1. Transient ischemia: An episode of transient ischemia of the brainstem may cause a temporary loss of consciousness, with a gradual awakening of consciousness after a period of time, accompanied by recurrent episodes. 2. epilepsy: epileptic seizures may cause temporary loss of consciousness, during which may be accompanied by twitching of limbs and foaming at the mouth, and after a period of time, may gradually awaken. 3. Vasovagal syncope: If the environment is more closed, or when the emotions are more strongly stimulated, it may cause vagal excitation, which is manifested as temporary loss of consciousness. If temporary loss of consciousness, it is recommended to observe closely, and if there is any abnormality, consult a doctor in time, and follow the doctor’s instructions for symptomatic intervention.