Sudden fainting, cold limbs, the people around should immediately determine whether the patient’s breathing, heartbeat, call 120, at the same time can initially determine the cause of the disease, give emergency treatment. Fainting, cold limbs of the patient, if there is no breathing, heartbeat, or can not determine the existence of breathing, in the carotid aorta can not be felt when the beat, are to immediately perform CPR. If there is breathing and a heartbeat and the patient has a companion, ask for a relevant medical history. If the patient is diabetic, he or she may be hypoglycemic, and a little sugary food or drink will usually provide immediate relief. If there is a history of coronary artery disease, you can take nitroglycerin and fast-acting heart pills under the tongue. If there are no medicines, let the patient stay quiet and wait for the emergency doctor to arrive. If there is rapid breathing, it may be a hysterical attack, you can use a paper bag around the patient’s mouth and nose to prevent respiratory alkalosis. There are many other reasons for this situation, as a non-medical professionals, in the discovery of the patient fainted, cold limbs, in addition to the above simple help at the same time, to first aid to call 120 emergency telephone and wait for the arrival of the doctor.