Although mostly a normal phenomenon, severe gas pain can be caused by a serious medical condition, according to Everyday Health. The serious underlying causes of severe gas pain may include appendicitis, kidney stones, Crohn's disease and abdominal tumor.
Aside from bloating and gas, stomach gas pain that is triggered by a serious medical condition may also manifest in other symptoms, states Everyday Health. For instance, appendicitis results in abdominal stiffness and tenderness. A patient should seek immediate medical attention if he experiences extreme gas pain. To diagnose the cause of excessive gas pain, the patient may undergo a blood test, X-ray test or computed imaging test. The method of diagnosis depends on the underlying problem.