What can cause excessive stomach gas and stabbing back pain?

Abd pain & bloating: Broad question. Consider allergies such as lactose or gluten. Testing by your doctor may reveal the source. With significant gas in the large intestine, some discomfort may be felt in the back in addition to abdominal bloating.

Agree with Dr. A: It is not feasible to provide a meaningful opinion without additional history, physical examination and may be some tests. Try reducing your intake of food as see if that helps.