The causes of chest pain when breathing are as follows: 1. Respiratory system diseases: such as bronchitis, pneumonia, tracheitis; 2. Chest wall problems; 3. Heart problems. If chest pain occurs after breathing, chest chest X-ray needs to be examined to observe the lung and heart morphology in the chest; an electrocardiogram is performed to observe the presence of heart ischemia; if the diagnosis cannot be confirmed, a chest CT can be done to determine the presence of pneumonia and other conditions. Some patients with chest wall pain after breathing or pain need to determine whether it is related to the amount of exercise. In this case, detailed examination and examination are required before a clear diagnosis can be made and further treatment can be performed.