Hidden pain in the lungs from inhalation may be caused by pleurisy, pneumothorax, coronary heart disease and other diseases. 1. Pleurisy: After being infected by bacteria, fungi or viruses and other pathogenic bacteria, pleurisy can be caused. After the chest area is stimulated by inflammation, symptoms such as cough and chest pain may occur. At this time, there will be a vague pain in the lungs of inhalation, and may also be accompanied by pleural effusion. 2. Pneumothorax: Chest injury, pneumonia or alveoli and other diseases, may lead to gas into the pleural membrane caused by the accumulation of gas resulting in pneumothorax disease. The gas will cause pressure on the tissues in the chest cavity, causing the patient to experience symptoms such as vague pain in the lungs when inhaling. 3. Coronary heart disease: coronary artery atherosclerosis will lead to narrowing or occlusion of the lumen, easily induced coronary heart disease. During the onset of the disease will lead to the patient to inhale the symptoms of vague pain in the lungs. Hidden pain in the inhalation lungs may also be caused by herpes zoster, lung cancer and other causes, it is recommended that the patient go to the hospital in a timely manner.