Lung pain may be caused by pneumonia, intercostal neuritis, pleural effusion, lung cancer and so on. 1. Pneumonia: Pneumonia is caused by bacterial infection in the lungs. When pneumonia accumulates to the parietal pleura, localized inflammatory edema can occur, which is prone to local nerve irritation leading to symptoms of pain. 2. Intercostal neuritis: Intercostal neuritis caused by infection, trauma and other reasons, manifested as chest pain, which can be aggravated after activities. If intercostal neuritis is not treated in time, it is easy to spread to the lungs and cause lung pain. 3. Pleural effusion: pleural effusion is mainly caused by inflammation, if not treated in time, it will easily damage the lungs and cause lung pain. 4. Lung cancer: Lung cancer will cause certain damage to lung tissues, and when the tumor invades and presses the surrounding tissues or nerves, it may lead to lung pain. Lung pain may also be caused by pneumothorax, pleurisy, reflux esophagitis and so on. Once the symptoms of lung pain appear, you need to go to the hospital in time to do lung-related examination to determine the specific cause of the disease and choose the appropriate treatment.