Generally, the pain under the right rib cage when running is a symptom caused by not adjusting the breathing properly, which causes a turn off in the air. Running fork in the air, there are two reasons, running before the preparatory work is not done, running did not adjust the breathing, resulting in air into the abdomen, caused by the fork in the air. So usually before running, we must do a good job of preparation, warm up in advance, exercise breathing through the nose, mouth half open, and must not just eat a full meal on the start of running, be sure to rest for two hours after running, running in the course of the fork in the pain, you can walk to relieve the pain, and then running.