There are many causes of lung pain, and the location of lung pain varies from cause to cause. There are differences in the location of lung pain caused by different causes and diseases. First, pleurisy: due to various causes of pleurisy, the pain is aggravated when breathing, especially when deep breathing is more obvious, the location is mostly located near the anterior axillary line and mid-axillary line under the chest, diaphragmatic pleurisy can cause pain in the lower chest. Second, pleural tumors: primary or secondary tumors of the pleura can cause lung pain, the location of the pain is consistent with the location of the tumor in the early stage, and the pain is all over the lungs when there is metastasis or invasion of the intercostal nerve in the late stage, and the pain is severe. Third, spontaneous pneumothorax, hemopneumothorax: often appear after sudden exertion, the site of lung pain is severe pain in one side of the lung, and there is difficulty in breathing, the performance of signs of pneumothorax or pleural effusion. Fourth, infectious diseases of the lung: involvement of the pleura and chest wall can cause pain, and the site of pain is related to the specific location of the lesion. There are many diseases that can cause lung pain, and depending on the cause, the pain site is also different. In addition, severe coughing can also cause lung pain, and the pain is usually located behind the sternum or under both lungs.