The causes of a little pain in the chest from time to time mainly include the following: First, it is considered to be caused by the respiratory system diseases of the body, including acute and chronic bronchitis, emphysema, ruptured alveoli and spontaneous pneumothorax, which can cause chest pain. It will be accompanied by respiratory symptoms, including breathlessness, chest tightness, cough and other symptoms, which can be clarified by chest X-ray examination. Second, consider that it is caused by intercostal nerve pain or chondromalacia of the body. Most of the intercostal nerve pain is caused by the history of trauma to the ribs, mostly at rest or at night, and the pain can be significantly relieved by taking nerve-nourishing drugs. The pain can be significantly relieved by resting and applying drugs to improve the heart muscle.