If you suddenly choke on something that is blocking the airway causing breathing difficulties, you can take the Heimlich maneuver at this time. Generally, the patient’s back with both hands clenched fist, with one hand of the big fish interval inward, upward impact on the patient’s upper abdomen, so that the diaphragm quickly upward, space pressure suddenly increased, so that there is a rush to the airway outward discharge, so that the foreign body just inside the airway out of the mouth, so as to lift the obstruction. If the person is obese, he can use the method of pressing the chest cavity, which can also achieve the above effect. If the patient is comatose, you can shock the supraumbilical abdomen after the patient is lying down, which can also achieve the purpose. Those who are critically ill should call 120 and ask medical personnel to deal with them.