The presence of pain in the lungs indicates a number of pathologic changes, the most common of which is an inflammatory reaction in the lungs. For example, due to the decline of resistance by bacteria, viruses, mycoplasma, chlamydia, fungi, mycobacterium tuberculosis and other possible pathogens invasion, and the mucous membrane of the lungs to varying degrees of inflammatory reaction, and even the emergence of pulmonary tissue exudation, the formation of cavities, the lungs will appear pain. In addition, it is also seen in rare malignant occupying lesions in the lungs, such as bronchopulmonary carcinoma, which stimulates the nerves in the lungs and causes pain, and it is also seen in intercostal neuritis, which causes intercostal neuralgia and lung pain.