Eating too large a meal can strengthen intestinal contractions, adding to any symptoms of abdominal pain and diarrhea. (verywellhealth.com)
They might experience more intestinal pain, too, because melatonin also suppresses intestinal contractions (Weissbluth and Weissbluth 1992). (parentingscience.com)
Smoke exposure may increase levels of motilin, a hormone that induces potentially painful intestinal contractions (Shenassa et al 2004). (parentingscience.com)