The common causes of running stomach pain on the right side of the abdominal wall soft tissue contusion, respiratory rhythm disorders, gastrointestinal spasm, digestive system diseases and so on. 1. Abdominal wall soft tissue contusion: if the running strength is too large or sudden strenuous exercise, it can cause abdominal wall soft tissue muscle strain. This in turn leads to pain on the right side of the stomach. 2. Respiratory rhythm disorder: if you don’t adjust your breathing when running, it can lead to the local tissues not being able to get enough oxygen, which in turn causes acute intercostal neuralgia, also known as the so-called fork in the air, which makes the right side of the stomach pain. It can usually be recovered by brief stretching, relaxation and deep breathing. 3. Gastrointestinal spasm: If you run in this state, it is easy to cause gastrointestinal dysfunction, resulting in gastrointestinal spasm, which leads to pain on the right side of the stomach. If the activity is strenuous, the gastric mucosa will also be pulled, which will also cause pain. 4. Digestive system diseases: such as chronic appendicitis, ulcerative colitis, intestinal torsion and other diseases. If the onset of running, will also be manifested in the right side of the stomach pain, but also nausea, vomiting and other discomforts, the need for early treatment for the original disease. In conclusion, running stomach pain on the right side of the stomach can be caused by physiological reasons or pathological reasons, if you feel uncomfortable, it is recommended to consult a doctor in time.