Self-testing coronary heart disease is not very accurate because the diagnosis of coronary heart disease requires a combination of electrocardiogram, cardiac ultrasound and, if necessary, coronary angiography in addition to clinical symptoms to be clear. If a patient is highly suspected of having coronary heart disease, it is recommended to go to a hospital as soon as possible to have a clear diagnosis by a professional cardiologist. From the patient’s own analysis, preliminary judgment can be made based on clinical symptoms as well as predisposing factors. Clinical symptoms: 1. Chest pain: The most common symptom of coronary heart disease is chest pain, the nature of chest pain is mostly colic or boring pain, often located in the palm-sized area of the precordial region, but also can be located in the posterior sternum or the middle and lower part of the sternum. The duration of pain is often within 10 minutes and usually does not exceed 30 minutes. If the pain lasts longer than 30 minutes, one should be alert to the possible presence of acute myocardial infarction. 2. Radiating pain: In addition to the onset of chest pain, some patients may also have radiating pain, which usually radiates to the left arm, shoulder, back and other parts of the body, and the patient may have a variety of accompanying symptoms such as weakness, palpitations and nausea during the pain. In terms of relief, the symptoms may be relieved a few minutes after resting or taking nitroglycerin. Second, triggering factors: common triggers of coronary angina are exertion or emotional excitement, so if the patient has chest tightness and chest pain in the case of strenuous activity, emotional excitement, tension and anxiety, be highly suspicious of coronary heart disease. Patients are advised to go to the hospital further to improve the examination to clarify the diagnosis.