If there is a muscle strain at the right side of the rib cage: 1. Pain and swelling at the muscle strain site, accompanied by obvious tenderness, because of the lack of soft tissue protection at this location, there will be obvious subcutaneous ecchymosis, petechiae, subcutaneous bruising. 2. 3, need to clarify the history of trauma, because this part of the muscle strain is relatively rare in the clinic, easy to miss and misdiagnosis. In addition to the above-mentioned performance, it is also necessary to clarify in what position the strain is caused, and there is a characteristic that this trauma-induced muscle strain will have a significant pain response after the strain, and will not start slowly.