Coronary heart disease is a common and frequent disease among middle-aged and elderly people. People in this age group should seek medical attention in time to detect coronary heart disease as early as possible if the following conditions occur in daily life 1.Posterior sternal or precordial area dullness, or tightness-like pain, radiating to the left shoulder and left upper arm, lasting for 3-5 minutes, and relieved on its own after rest, occurs during exertion or mental tension. 2.Physical activity with chest tightness, palpitation and shortness of breath, which is relieved by itself at rest. 3.Persons with exercise-related headache, toothache, leg pain, etc. 4.People who have chest pain and palpitations when having a full meal, being cold or watching a thrilling movie. 5.When sleeping at night with a low pillow, you feel tightness in your chest and need to lie down with a high pillow to feel comfortable; when sleeping or lying down during the day, you suddenly have chest pain, palpitations and difficulty in breathing, which can be relieved by sitting up or standing up immediately. 6.Heart panic, chest tightness, shortness of breath or chest pain when having sex or straining to defecate. 7.Hearing noise will cause panic and chest tightness. 8.Recurring irregular pulse, unexplained tachycardia or bradycardia. For early detection of coronary heart disease, people over 40 years old should have the following tests done regularly: If the test results are abnormal or there are other risk factors for coronary heart disease, blood cholesterol tests should be done once or more every five years. Blood pressure check once a year. Blood glucose test once a year. If you are at high risk for coronary heart disease, ask your doctor to see if you need an electrocardiogram. If further testing is needed, your doctor will arrange for an exercise test to measure your ECG while pedaling a stationary bike or on an exercise bike. Coronary angiography is the most certain way to diagnose coronary artery disease.