Fainting in medical terms generally refers to loss of consciousness, loss of consciousness accompanied by foaming at the mouth should keep the patient in a supine position with the head tilted to the side as much as possible to prevent the tongue root from falling back and blocking the airway, or when the patient vomits it is easy to cause mis-aspiration, have vomit and cause asphyxia, aspiration pneumonia and other conditions. Therefore, the patient should be fasted until he or she regains consciousness to avoid force-feeding that leads to food entering the airway for asphyxiation. If a patient has a convulsion, do not pull the patient’s limbs to avoid limb damage. Sometimes the patient may be in cardiac arrest, and it is important to assess the patient’s pulse and respiration as soon as possible. If the aortic pulses are gone, start the CPR process immediately.