Hidden pain in right upper chest of a man may be caused by chest wall muscle strain, pleurisy, right upper lung cancer and so on. 1. Chest wall muscle strain: In the process of upper limb muscle exercise, due to inappropriate stretching or excessive stretching, chest wall muscle strain occurs, causing local pain, and male patients may feel vague pain in the upper right side of chest. 2. Pleurisy: bacterial infection in the right upper pleura causes pleurisy, inflammation stimulates pleura, leading to inflammatory reaction and localized pain, and male patients may feel vague pain in the right upper chest, and breathing may aggravate the pain. 3. Right upper lung cancer: when right upper lung cancer invades the pleura or right mediastinum, it will lead to damage of local tissues and cause pain, and patients can feel vague pain in the right upper chest. Hidden pain in the upper right side of chest may also be caused by pneumonia and pneumothorax, etc. Patients should go to the hospital in time to improve the examination and give targeted treatment after clarifying the cause of the disease.