There are various symptoms of angina pectoris, the more typical ones are suffocation, colic and squeezing pain in the anterior region of the heart. In angina pectoris, the pain is mainly located in the posterior part of the sternum and is characterized by paroxysms, and the patient has a sense of fear or even a sense of near death. The pain usually lasts 3 to 5 minutes, and the longest time does not exceed 15 minutes. Especially easy to attack when labor or emotional excitement, sublingual nitroglycerin, the pain symptoms can be relieved. Angina pectoris can also be accompanied by other symptoms, can be radiated to the precordial region and the left upper limb, the pain is usually located in the lower part of the sternum before the left heart, but may also occur in the upper abdomen, the left scapula or the right anterior chest, the elderly may only have the left anterior chest discomfort or feeling of tightness. Angina attack should immediately stop all activities, sublingual nitroglycerin, as soon as possible to call 120 to the hospital emergency treatment.