Mechanism | IBS | FD |
| +++ | +++ |
Upper Gastrointestinal dysmotility | + | +++ |
Lower Gastrointestinal dysmotility | +++ | + |
Brain Processing abnormalities | ++ | ? |
Genetics | + | + |
Psychiatric comorbidities | ++ | + |
Post-infection | ++ | + |
Serotonin Signalling abnormalities | + | + |