The pain of distention refers to the pain caused by the swelling sensation of bilateral coercive rib area, generally the two sides of the coercive rib area refers to the 6th-12th ribs in the mid-axillary line of both sides, the most likely cause of distention of pain in these places is the local soft tissue injuries, such as being pressed by the heavy objects or extrusion injuries, as well as the result of direct blow injuries. It is also possible that the pain is caused by local soft tissue inflammation, the most common is costochondritis, which is a kind of aseptic inflammation, with activities or often caused by chronic extrusion and stimulation, if the inflammation is more serious, there will be localized swelling, skin flushing, pain, such as redness, swelling, heat, pain, and the manifestation of acute inflammation.