It is important to look at whether it is internal or external to the lungs, including whether there is any damage to the skin, including any problems with the bones in this area. Sometimes there is non-specific costochondritis, and the pressure will also be painful and obvious. There is also an intrapulmonary lesion involving the pleura in this area, which will have pain more obvious. It is advisable to go to the hospital and have a chest CT done to see if there are any lesions in the lung, such as some tumors, tuberculosis or special infections, which may cause pain in the local area after the lesions involve the pleura. Because most of the lesions in the lungs are not painful, check to see what the specific cause is.