Chest pain is usually associated with respiratory movements, suggesting the possible existence of respiratory system diseases. Common causes of chest pain when breathing are as follows: 1. chest wall diseases, such as pleurisy and pleural tumors; 2. cardiovascular diseases, including angina pectoris or macrovascular diseases; 3. diseases of the respiratory system itself, such as pneumonia or lung cancer, may also cause respiratory chest pain; 4. mediastinal diseases, such as esophagitis, may also cause respiratory chest pain; 5, Other diseases, such as pneumothorax, hemothorax, etc. When the above conditions occur, patients must go to the hospital for corresponding examination, such as CT examination to exclude lung lesions and chest wall lesions. After that, the nature will be clarified and the corresponding treatment will be carried out according to different etiologies.