Hidden pain under the right chest of a man may be caused by muscle strain, chronic cholecystitis, pneumonia, pleural effusion and other reasons. 1. Ligament strain: due to improper posture during fitness exercises or frequent lifting of hanging objects, external collision, etc., may lead to muscle damage under the chest, so the symptoms of vague pain. 2. Chronic cholecystitis: due to the presence of gallbladder stones, or the presence of gallbladder emptying obstacles, bacterial infections, etc., which may lead to the patient’s right upper abdomen or the right lower chest hidden pain. 3. Pneumonia: When there is pneumonia in the right lower lung, the patient may have symptoms such as coughing, coughing up sputum and fever. As the inflammation stimulates the pleura, or when the cough is severe, it may be manifested as vague pain in the lower right chest. 4. Pleural effusion: due to the right pleural effusion stimulation pleural nociceptive nerve causing chest pain, may involve the right lower chest, the symptoms of hidden pain. There may be other reasons for men to have vague pain under the right chest, it is recommended to go to the hospital in a timely manner to clarify the cause of the disease, and actively treat it under the guidance of the doctor.