If the sudden onset of chest pain occurs after physical activity or emotional excitement, angina pectoris should be considered a possibility. Angina pectoris is usually relieved within 3-5 minutes by resting or taking medications such as fast-acting heart pills or nitroglycerin, and is considered to be simple angina pectoris. If the chest pain lasts for more than 30 minutes and is accompanied by sweating, a sense of dying, and is not relieved by rest, and nitroglycerin is basically ineffective, then the possibility of myocardial infarction should be considered. Another rare clinical condition is aortic coarctation. Because of the sudden increase in blood pressure leads to the tearing of the inner membrane of the aorta, there will also be severe colic or even manifested as tearing pain. In this case, the diagnosis needs to be confirmed immediately with an enhanced CT of the aorta. Of course, some patients with pulmonary embolism may also have angina, which requires differential diagnosis under the guidance of a doctor.