Hidden pain in the middle of upper chest may be caused by angina pectoris, viral myocarditis, aortic dissection, reflux esophagitis, lung cancer and other diseases. 1. Angina pectoris: myocardial ischemia and hypoxia caused by insufficient blood supply to the heart vessels, chest pain will occur when the body’s oxygen demand increases or the blood vessels are seriously blocked, and the symptom may only be hidden pain in the chest in the mild cases, but there may be squeezing pain in the serious cases. 2. Viral myocarditis: it is a heart disease caused by viral infection with inflammatory reaction of myocardial cells and endocardium. Clinical manifestations are related to the scope and location of the lesion, and a few patients only have symptoms such as vague pain in the chest and palpitation (rapid heartbeat, often accompanied by panic). 3. Aortic coarctation: It is a critical cardiac disease caused by blood breaking into the middle layer of the aortic wall and forming a hematoma. Typical symptoms are knife-cutting and tearing pain in the chest, but some patients only have vague pain in the chest, toothache, abdominal pain and other symptoms. 4. Reflux esophagitis: it is a gastroesophageal reflux disease caused by abnormal barrier function of the esophageal mucosa, which usually occurs one hour or so after eating, with pain behind the sternum, heartburn, acid reflux, belching (hiccup) and other manifestations. 5. Lung cancer: it is a malignant tumor occurring in lung trachea, bronchus, glands and other parts of the lungs. In early stage, it may have no obvious manifestation, only vague pain and discomfort in chest, coughing and coughing up sputum, etc. In late stage, it may have hemoptysis, blood in sputum, emaciation and other symptoms. If the pain in the middle of the chest is not relieved for a long time, you should pay attention to it and go to the hospital for electrocardiogram and other examinations.