Coronary heart disease is one of the common and frequent diseases among middle-aged and elderly people, and the following characteristics will generally appear, which need to be paid high attention and to seek medical attention in time to detect coronary heart disease as early as possible. A. Dullness and pressure pain in the posterior sternum or precordial region when exertion or nervousness occurs, and radiates to the left shoulder and left upper arm, which usually lasts for 3-5 minutes and can be relieved by itself after rest. Chest tightness, palpitations and shortness of breath during physical activity, which can be relieved by itself at rest. Headache and toothache associated with exercise. IV. Chest pain and palpitations occur during a full meal, cold or watching a thrilling movie. V. During night sleep, chest tightness and breath-holding are felt when the pillow is low, and comfort is felt after lying in a high pillow position. Sixth, panic, chest tightness, shortness of breath or chest pain discomfort when having sex or straining to defecate. VII. Hearing high-decibel noise causes panic and chest tightness. Recurrent irregular pulse, unexplained rapid or slow heartbeat.