Vasovagal syncope is a type of syncope that is relatively benign, and by benign I mean that the prognosis is relatively good. Syncope is a manifestation of inadequate blood supply to the brain, and there are many causes of syncope, including vascular-related syncope. Normally, vagal excitation leads to a slowed heart rate and decreased blood pressure, and sympathetic excitation leads to an increased heart rate and increased blood pressure. Vaso-vagal syncope is a condition in which both vascular epidermis and visceral vessels dilate due to over-stimulation of the vagus nerve, resulting in decreased heart rate and decreased blood pressure, leading to dizziness, panic, sweating, nausea, vomiting, and even falling. This condition is mostly seen in women, people who eat breakfast irregularly, are relatively thin, more stressed, and more strained. There are usually signs and symptoms before the onset of the disease, such as sudden loss of concentration, inability to see clearly, nausea, vomiting, and night sweats. Patients are advised to simply lie down when they feel like falling down to avoid hurting themselves. If you hold on hard and fall down later, brain bleeding or fracture can occur and even endanger your life. This is generally easy to occur under poor ventilation and exertion, and more attention should be paid to avoid similar situations. It is easier to prevent such events by choosing a spacious room and finding a more well-ventilated place to rest. There are three types of vasovagal syncope: 1) cardiac depression, in which the heart rate only drops and the blood pressure does not; 2) vasovagal depression, in which the blood pressure only drops and the heart rate does not; 3) mixed type, in which both the blood pressure and the heart rate drop. When a sudden fainting situation occurs, regardless of the cause, you cannot identify it by yourself, so you have to find a doctor to identify it and exclude pathological causes of syncope.