Standard gastroenterology is designed to rule out serious pathology — Crohn's disease, coeliac disease, bowel cancer. When those are excluded and symptoms persist, the diagnosis defaults to IBS — a label, not an explanation. IBS tells you what your symptoms are called. It doesn't tell you what's causing them.
In clinical practice, the most common underlying drivers of persistent gut dysfunction include SIBO (small intestinal bacterial overgrowth), intestinal permeability, gut dysbiosis, impaired motility, and unresolved food reactions driven by immune activation — not simple food intolerance. These rarely show up on standard gastroenterology investigation. They require functional testing to identify.
The gut is also the foundation of systemic health. When gut function is compromised, the downstream effects are wide-ranging — fatigue, brain fog, mood disruption, skin conditions, immune dysregulation, and hormonal imbalance. Treating the gut in isolation misses this. A full picture requires investigating how the gut interacts with every other system.