Determination of chest tightness and stomach bloating, first of all, according to the patient’s disease history, for example, if the patient has a clear coronary heart disease, unstable angina, myocarditis, pericarditis, rheumatic heart disease, hypertensive heart disease and other diseases, if there is a feeling of tightness in the precordial area to be considered as chest tightness. In the case of previous diseases of the digestive system, such as reflux esophagitis and gastroduodenal ulcer, gastric distension usually occurs. In addition, patients with gastric distension usually experience it after a full meal, such as after eating a large amount of greasy food. If the patient also has some pain, such as pain in the precordial area radiating to the back of the left shoulder, the accompanying symptoms usually belong to chest tightness and do not belong to gastric distension.