| IBS | irritable bowel syndrome |
| CNS | central nervous system |
| IBD | inflammatory bowel disease |
| SIBO | small intestinal bacterial overgrowth |
| IBS-D | IBS with diarrhea |
| IBS-C | IBS with constipation |
| FODMAP | fermentable oligosaccharides, disaccharides and monosaccharides and polyols |
| FMT | fecal microbiota transplantation |
| QOL | quality of life |
| NNT | number need to treat |
| NNH | number needed to harm |
| ATP | Adenosine triphosphate |
| 5-HT4 | 5-Hydroxytryptamine receptor 4 |
| 5-HT3 | 5-Hydroxytryptamine receptor 3 |