People still have a rather ambiguous concept of pain, such as angina pectoris and myocardial infarction, both of which have a rapid onset and vicious symptoms. And, both present with critical symptoms of chest angina and suffocation, so they are easily confused and difficult to distinguish. Here’s my answer to the difference between the symptoms of angina and myocardial infarction! From the frequency of attacks: 1, angina: pain into cramp-like pain, pain time is short, usually no more than 15 minutes; 2, myocardial infarction: severe pain in the precordial region, individual manifestations of toothache, shoulder pain or back pain, lasting up to several hours or even longer. In terms of attack symptoms: 1, angina pectoris: no fever, rarely arrhythmia, shock and heart failure, oral nitroglycerin is effective; 2, myocardial infarction: often accompanied by shock, arrhythmia and heart failure, and fever, nitroglycerin is generally ineffective. In terms of ECG examination: 1. angina pectoris: generally there is rarely an increase in white blood cells, an increase in the erythrocyte sedimentation rate or an increase in serum cardiac enzymes, and the ST segment of the ECG is temporarily depressed or elevated or there is no change; 2. myocardial infarction: the ST segment of the infarct-oriented site is elevated and there are abnormal Q waves. Increased white blood cell count, creatine phosphokinase, portal aminotransferase, lactate dehydrogenase, myoglobin, and myoglobin light chain, and increased erythrocyte sedimentation rate. From the site of pain: 1, angina: pain generally occurs in the upper or middle part of the sternal body after the crushing, stuffy or narrow rest pain, may also spread to most of the precordial area, radiating to the left shoulder, the front medial side of the left upper limb, up to the ring finger and little finger, may be accompanied by the fear of dying feeling, often forcing the patient to immediately stop activities, while often accompanied by chest tightness, breath-holding, sweating, nausea, vomiting, pallor, and Myocardial infarction: often accompanied by persistent severe pain behind the sternum, acute circulatory dysfunction, arrhythmia to heart failure.