A little hidden pain in the chest may be caused by chest wall lesions, lung and pleural lesions, cardiovascular lesions, mediastinal and esophageal lesions. 1. Chest wall lesions: such as costochondritis, intercostal neuritis, pectoral muscle strain and so on, may cause the symptom. 2. Lung and pleural lesions: such as pneumonia, tuberculosis, bronchopulmonary cancer, pulmonary infarction, spontaneous pneumothorax, pleural adhesions, etc. 3. Cardiovascular lesions: such as angina pectoris, pericarditis, myocarditis and so on. 4. Mediastinal and esophageal lesions: caused by mediastinal tissue pressure and other factors, such as acute mediastinitis, mediastinal emphysema, mediastinal tumor, esophageal periphlebitis and so on. It is recommended that those who have a little hidden pain in the chest should consult a doctor in time to clarify the cause and standardize the treatment under the doctor’s guidance so as to avoid delaying the condition.