Inhalation chest pain is caused by inspiratory respiratory movement induced chest wall neuromuscular tissue lesions, lung and pleural cavity lesions, and cardiac disease and other stimulus factors acting on the nociceptive nerve endings and causing pain. 1. Chest wall neuromuscular tissue lesions (1) Functional diseases: chest respiratory muscle fatigue or cardiac neurosis can cause left chest pain during inspiration, but there is no organic change in the neuromuscular tissue. (2) Neuroinflammation and sternal lesions such as costochondritis, intercostal neuritis, sternal bone fracture, sternal tumor, etc. can also cause chest pain during inspiration. 2. Lung and pleural cavity lesions: lung infection, lung cancer, pneumothorax, pleurisy, pleuritis, pleural mesothelioma and other diseases stimulate the pleura of the posterior sternal wall during inhalation and cause thoracic referred pain. 3. Heart disease: pericarditis, viral myocarditis and other diseases stimulate the wall layer of the pericardium during inhalation causing chest pain. If you feel chest pain when inhaling, it is recommended to go to the hospital for further diagnosis and treatment.