In fact, chest pain can be caused by many reasons, and finding the original cause can really improve the symptoms. Definition of coronary heart disease Coronary atherosclerotic heart disease (referred to as coronary heart disease), refers to coronary artery atherosclerosis caused by lumen narrowing or occlusion, resulting in myocardial ischemia and hypoxia or necrosis caused by heart disease, also known as ischemic heart disease. Diagnosis of coronary artery disease: 1. Typical chest pain (angina): pain is located in the posterior sternum and precordial area or under the saber, can radiate to the left shoulder and left arm medially, even to the ring finger and little finger, can also radiate to the left neck or cheek (mistaken for toothache), often with a sense of pressure, mostly in the course of emotional excitement or activity, lasting for a few minutes can be relieved, generally not more than half an hour, the patient can feel pain at the same time back, shoulder The pain can be accompanied by back, shoulder, left upper limb pain, neck, jaw, teeth, abdominal pain, etc. 2.Electrocardiogram, exercise stress test, isotope myocardial imaging, 24-hour ambulatory electrocardiogram, etc. suggest ischemic changes. 3.Coronary angiography shows coronary artery stenosis over 50%. Common triggers of coronary artery disease: emotional excitement, exercise factors, cold weather, and large amounts of food. Atypical symptoms of coronary heart disease: dyspnea, nausea or indigestion, palpitations, syncope, weakness, excessive sweating, panic, etc. Other possible causes of chest pain: 1. Clamped aneurysm: more severe tear-like pain or cone pain, mostly located in the back of the chest, radiating downward to the lower abdomen, waist with both sides of the groin and lower limbs. 2, other heart disease: pericarditis, myocarditis, endocarditis, wind heart disease, hypercardia, syphilitic heart disease, precordial disease, cardiomyopathy, etc. 3, digestive tract: gastric or esophageal lesions: the former has a certain time pattern of pain and eating, and the latter has swallowing difficulties or pain. Biliary system disease: mostly in the right lower chest, related to eating greasy food, or physical activity. 4. Respiratory system: pleurisy, peripheral pneumonia, pulmonary embolism, pneumothorax, lung cancer, etc. Persistent pain, aggravated by breathing and coughing, pneumothorax is sudden and dominated by breath-holding. 5, neurosis: related to emotions, often relieved by sighing or belching. 6.Herpes zoster, subcutaneous soft tissue inflammation, muscle strain, cervical spondylosis, rib osteitis, osteochondral joint lesions, etc. can also cause chest pain.