Cardiac pain is mainly seen in the following diseases.1, respiratory diseases, common such as pleurisy, pneumonia, pneumothorax and so on. In addition to the manifestation of pain in the heart, this kind of disease often has the characteristics of respiratory diseases, such as pain and respiratory relationship can be accompanied by coughing, coughing up sputum, dyspnea and other manifestations, improve the chest CT can help to clarify the diagnosis. 2, circulatory diseases, common such as coronary heart disease, angina pectoris, etc. These diseases often manifest pain with activity, emotional stress has a certain correlation, after rest or rest or emotional stress. These diseases often show pain and activity, emotional excitement has a certain correlation, after rest or sublingual nitroglycerin can be quickly relieved, the onset of electrocardiogram can be seen ST-T changes, improve the coronary angiography is more helpful to clarify the diagnosis. 3, digestive system diseases, gastritis, gastric ulcer, esophageal spout inflammation, etc. will also appear in the fossa of the heart pain, often with the appearance of the meal, to be the next meal that is the fasting pain relief or disappear, the upper gastrointestinal system disease, gastric ulcers, inflammation, etc. will also appear in the heart. When the pain is relieved or disappears before the next meal, upper gastrointestinal barium meal or gastroscopy can help to make a clear diagnosis.