Coronary heart disease is a common and frequent disease among middle-aged and elderly people. People in this age group should seek medical treatment in time to detect coronary heart disease as early as possible if the following situations occur in their daily life. 1.Back of the sternum or precordial region of boring pain, or tightness-like pain, and to the left shoulder, left upper arm radiation, lasting 3-5 minutes, after resting on their own to relieve the person. 2. Chest tightness, palpitation, shortness of breath during physical activity, which is relieved by rest. 3.Headache, toothache and leg pain related to exercise. 4. Chest pain and palpitation when stimulated by a full meal or cold. 5, sleep at night when the pillow is low, feel chest tightness and breathlessness, need a high pillow lying position to feel comfortable; asleep, or lying down during the day suddenly chest pain, palpitation, dyspnea, need to sit up or stand up immediately can be relieved. 6. Panic, chest tightness, shortness of breath or chest pain when having sex or straining to defecate. 7. Unexplained tachycardia or bradycardia.