Myocardial insufficiency pain typically presents as a crushing pain behind the sternum. Atypical pain may have other parts such as jaw, neck, left shoulder, left upper arm, inner forearm, left little finger, epigastrium, etc.; and other nature of pain such as boring pain, constricting pain, unspecified generalized pain. 1. Typical pain manifestation: due to myocardial ischemia, lactic acid and other acidic substances gather, stimulate blood vessels to produce pain, typical pain manifested as pressure pain behind the sternum, if for a few minutes to ten minutes to relieve, may be angina pectoris, the pain continues to be unable to relieve may be for myocardial infarction. 2. Atypical pain manifestation: part of myocardial blood supply insufficiency may cause atypical manifestation of pain in other parts, such as jaw, neck, left shoulder, left upper arm, inner forearm, left little finger, upper abdomen, etc.’. There may also be non-compressive pain changes such as dull, constrictive sensory pain. It needs to be differentiated from gastritis, gastric ulcer, gastric reflux esophagitis, frozen shoulder and other diseases. If related symptoms occur, it is recommended to go to the hospital in time, under the guidance of the doctor for electrocardiogram, troponin and other tests, and active treatment, so as not to delay the condition.