Angina pectoris is a common symptom of coronary artery disease. It is a clinical syndrome caused by insufficient blood supply to the coronary arteries and acute, temporary ischemia and hypoxia of the myocardium, characterized by paroxysmal anterior chest crushing pain, which may be accompanied by other symptoms, mainly located in the posterior part of the sternum, radiating to the precordial area and left upper extremity, often occurring during labor or emotional excitement, lasting several minutes, and disappearing after rest or nitrate preparation. The sudden onset of angina in patients with coronary artery disease often catches people off guard. How to deal with angina when it occurs? It is very important to keep in mind the following four-step self-help method. 1, immediately stop the activity, rest in place: angina attack immediately rest in place, do not walk, but also try to talk less, deep whistling. Stay in a semi-recumbent position (or sitting), no need to lie down, do not stand. 2, take emergency medicine: if you have the medicine with you, put a piece of nitroglycerin (or quick-acting heart pills 10-15) under the tongue to take, usually 2 ~ 5 minutes to take effect, the pain will gradually reduce. If the pain can not be relieved, can be 5 minutes after containing 1 tablet, but the continuous use of not more than 3 tablets. 3, control emotions: angina attack, the heart’s severe pain makes people in extreme fear, tension and other bad emotions, which is very detrimental to the relief of angina. In order to avoid fear and tension, keep a calm state of mind. 4, call for help: relay to relatives or directly call 120, after which try to maintain a state of rest and wait for the arrival of doctors. In addition, usually carry common emergency medicine with you when you go out, and regularly check to make sure that the medicine is within the expiration date and has not deteriorated, etc., in order to prevent the problem before it happens.