Right abdominal pain during running may be a result of gastrointestinal syndrome occurring under high intensity exercise.
The phenomenon is particularly likely to occur during or after endurance sports events such as marathons and triathlons, with an incidence of about 20% to 50%, causing patients to suffer from abdominal pain, diarrhoea, regurgitation, nausea and even gastrointestinal bleeding. The phenomenon is usually thought to be related to reduced blood flow to the gastrointestinal tract during strenuous exercise, repeated up and down vibrations of the stomach and intestines during running, and changes in gastrointestinal endocrine secretion.
In addition, unreasonable high intensity exercise may also increase the incidence of peptic ulcers, which in turn may lead to right abdominal pain. Small to medium intensity exercise is usually considered more beneficial and reasonable exercise is recommended in general.