Chest pain when inhaling may be related to heart disease, pleural cavity disease, chest wall muscle neuropathy, lung disease and so on. 1. Heart diseases: pericarditis, viral myocarditis and other diseases stimulate pericardial friction during inhalation causing chest pain. 2. Pleural cavity diseases: pneumothorax, pleurisy and other diseases stimulate pleural friction when inhaling to appear chest pain. 3. Chest wall musculoskeletal neuropathy: chest wall bone fracture, muscle soft tissue contusion, costochondritis, intercostal neuritis and other diseases can cause chest pain when pulling and stimulating during inhalation. 4. Lung diseases: inflammatory factors stimulate alveolar nerve endings causing chest pain when lung infection occurs, and respiratory movements or activities can induce or aggravate the pain. It is recommended to go to the hospital for examination to identify the cause of chest pain when inhaling, and then treat it under the guidance of the doctor.