Angina pectoris, its generally caused by coronary heart disease, acute myocardial infarction, but also may be aortic valve stenosis, hypertrophic obstructive cardiomyopathy and other diseases. 1. Angina pectoris: a clinical syndrome caused by insufficient blood supply to the coronary arteries, myocardial ischemia and hypoxia. It mainly manifests as episodic precordial pain, and the nature of pain is oppressive, stuffy or suffocating, which may be accompanied by symptoms such as chest tightness, shortness of breath and dyspnea. 2. Acute myocardial infarction: refers to acute and persistent severe ischemia and hypoxia of the myocardium caused by sudden blockage of coronary blood vessels, which then leads to myocardial necrosis. The main manifestations are severe pain in the precordial region, dyspnea, palpitation, irritability, sweating, dizziness, pallor, cold and clammy skin, and a sense of imminent death. 3. Aortic valve stenosis: refers to the narrowing of the opening of the aortic valve, blood flow from the left ventricle into the aorta is blocked. It starts slowly and may have no obvious symptoms. As the condition worsens, symptoms such as angina pectoris, fainting and dyspnea may appear. 4. Hypertrophic obstructive cardiomyopathy: the septum is highly hypertrophied and protrudes into the cavity of the left ventricle, resulting in obstruction of the left ventricular outflow tract. Its main manifestations are blackout, syncope, dyspnea, chest pain, fatigue, palpitation and other symptoms, which can also be manifested as angina pectoris. There are many other causes of angina pectoris, which should be emphasized, and timely consultation should be made to find out the cause of the disease and follow the medical advice for further treatment or therapy.