1, pay attention to the onset of conditions: angina pectoris often occurs in labor, exertion, emotion, excitement, bowel movement, exertion and other myocardial oxygen consumption increases, while non-angina often occurs at rest, leisure. 2, pay attention to the duration of pain: angina lasts less than 15 minutes, while non-angina chest discomfort often lasts for hours or even all day. 3, pay attention to the nature of chest pain: angina pectoris is the anterior region of the heart pressure-like boring pain or indescribable discomfort, can be at the same time to the left shoulder, the left upper arm radiation, and non-anginal pain can be manifested as pain, lightning-like pain, stabbing pain, and so on. 4, pay attention to the chest pain site: angina discomfort site in the lower part of the sternum, the area is about the size of the palm of the hand, can be radiated to the left side of the shoulder blade, little finger side, some patients may be manifested as toothache, pharyngeal constriction. The performance of non-anginal pain is variable, can be in the left precordial area such as the needle tip of a large area, a moment left, a moment right, the site is often not fixed. 5, pay attention to chest pain accompanied by symptoms and drug relief effect: angina pectoris often appear at the onset of weakness, cold sweat, palpitations, severe blood pressure drop, shortness of breath, have a sense of imminent death. Non-angina people have no obvious systemic symptoms at the onset of the disease. In angina pectoris, the symptoms of angina pectoris can tend to be relieved within 5 minutes after oral nitroglycerin. In non-angina patients, nitroglycerin is often ineffective. 6, pay attention to the relevant history of concomitant diseases: angina pectoris is the most common symptom of coronary heart disease, it must have a variety of risk factors for coronary heart disease, such as hypertension, hyperlipidemia, diabetes; old age, mental workers; smoking history, some patients have a family history of coronary heart disease. The non-angina people do not have the above diseases and family history, if there is also only a mild and a small number of concomitant disease.