The anterior chest pressure pain caused by insufficient coronary artery blood supply, lasting about a few minutes, is a group of angina pectoris clinical syndrome, is the conflict between the coronary artery blood supply and myocardial blood demand, coronary artery blood flow can not meet the needs of myocardial metabolism, causing myocardial acute, temporary ischemia and hypoxia, that is, angina pectoris. Then, the following is to introduce the anterior chest pressure pain easily confused symptoms to identify: 1, cardiac neurosis: patients with this disease often complained of chest pain, but for a brief (a few seconds) stabbing pain or more persistent (a few hours) hidden pain, the patient often like to take a deep breath or sighing breath from time to time. The chest pain is mostly located near the apical region under the left breast, or changes frequently. The symptoms appear mostly after fatigue, but not at the time of fatigue, and the patient feels comfortable with light activities, and sometimes can tolerate heavier physical activities without chest pain or chest tightness. Containing nitroglycerin is ineffective or only after more than 10 minutes, often accompanied by palpitations, fatigue and other symptoms of neurasthenia. 2.Acute myocardial infarction: The pain site of this disease is similar to that of angina pectoris, but the nature is more intense and lasts for several hours, often accompanied by shock, arrhythmia and heart failure, and fever, which cannot be relieved by nitroglycerin. The ST-segment elevation in the leads facing the infarct site in the electrocardiogram and abnormal Q waves are present. Laboratory tests showed that the white blood cell count and serological tests showed that creatine phosphokinase, portal aminotransferase, lactate dehydrogenase, myoglobin and myoglobin light chain were increased, and the erythrocyte sedimentation rate was increased. 3, syndrome X (syndromeX): This disease is caused by small coronary artery diastolic dysfunction, with recurrent exertional angina as the main manifestation, pain can also occur at rest. Myocardial ischemia can be shown on ECG during attack or after stress, and myocardial perfusion can show defects on nuclear myocardium, and segmental ventricular wall motion abnormalities on echocardiography. However, this disease is mostly seen in women, the susceptibility factors of coronary artery disease are not obvious, the pain symptoms are not very typical, the coronary angiogram is negative, the left ventricle does not show hypertrophy, the ergometrine test is negative, the treatment response is unstable and the prognosis is good, then it is different from coronary angina. 4, other diseases caused by angina: including severe aortic stenosis or closure insufficiency, rheumatic fever or other causes of coronary arteritis, syphilitic aortitis caused by coronary artery mouth narrowing or occlusion, hypertrophic cardiomyopathy, congenital coronary artery malformation, etc. are caused by angina, to be differentiated according to other clinical manifestations. 5, intercostal neuralgia: the pain often involves 1 to 2 intercostal, but is not necessarily limited to the anterior chest, stabbing or burning pain, mostly persistent rather than episodic, coughing, forceful breathing and body rotation can make the pain increase, there is pressure pain along the nerve path, there is local pulling pain when the arm is lifted, so it is different from angina pectoris. In addition, atypical angina pectoris should be distinguished from chest and abdominal pain caused by esophageal lesions, diaphragmatic hernia, ulcer disease, intestinal disease, cervical spondylosis, etc.