From the medical point of view, there is no suppression period of shock, and shock is usually divided into three stages, which are pre-shock, mid-shock and late shock. Patients in the pre-shock stage will have excessive nervousness, anxiety, irritability, slightly lowered blood pressure or normal blood pressure, reduced urine volume or normal urine volume, as well as pale, wet and cold, and a fine and rapid pulse. In the middle stage of shock, there will be a decrease in urine volume, a decrease in pulse rate, a decrease in pulse pressure difference, a pale face that turns into cyanosis, and a typical wet chill in the extremities. In the middle and late stages of shock, the patient may experience loss of consciousness, unmeasurable blood pressure, absence of urine or extreme decrease in urine output.