If you are running, you should stop running fast and walk slowly, then try to relax your body and adjust your breathing rhythm. When exhaling, use deep breaths and exhale hard outwards; slow down the frequency and use two steps (three steps) with one exhale and one inhale; you can tap on the painful area. It is advisable to warm up your breathing muscles before exercise to allow them to gradually adapt to the tension. If the pain is severe, or if there is a combination of trauma, you will need to go to a hospital for general surgery or emergency medicine.