To be considered rumination syndrome, regurgitation of recently ingested food needs to occur for at least six weeks, though it may come and go. Regurgitation typically:
Frequency of rumination varies greatly between patients. Some ruminate only a few times a week, while others ruminate after every meal.
Rumination syndrome can be confused with gastroparesis, an upper gastrointestinal motility disorder that results in slow stomach emptying. The chart below helps distinguish symtoms of gastroparesis from rumination syndrome:
| Gastroparesis | Rumination Syndrome | |
|---|---|---|
| Periodicity | Few bad days a month | Every day, every meal |
| Timing | 2-4 hours after meal | About half an hour after a meal |
| Vomitus | Bitter, sour | Just like food |
| Re-swallows Food | Never | Often |