Hidden pain in the right lung is usually caused by lung or pleural diseases, which is common in right lung infection, lung contusion, pneumothorax, pleural diseases, etc. The pain can be caused by various irritating factors from right lung infection, tuberculosis, lung tumor and so on. 1. Right lung infection, tuberculosis, lung tumor and other diseases produce various stimulating factors that act on the nociceptive nerve endings, which can lead to vague pain in the right lung, which is often combined with coughing, coughing up sputum, fever and even hemoptysis and other symptoms. 2. Lung contusion: when the right lung is contused due to trauma, the lung parenchyma, interstitial and alveolar hemorrhage, edema, and irritation of alveoli and pleura can also lead to vague pain in the right lung. 3. Pneumothorax: when right pneumothorax occurs, there will be pain in the right side of the chest, the nature of the pain varies according to the individual’s physique, and in severe cases, dyspnea will also occur. 4. Pleural diseases: right pleurisy, right pleural tumor and other pleural diseases stimulate the nerve endings in the wall pleura, which can also lead to vague pain in the right lung. The patient is advised to go to the hospital for further diagnosis and treatment for vague pain in the right lung.