stomach and intestines;  gastrointestinal tract;  digestive organs
 cecum;  caecum;  (vermiform) appendix;  appendicitis
 large intestine;  large bowel;  colon
 intestinal;  inside the intestines
 intestinal fluids (juices)
 heartbreak;  grief;  sorrow
 volvulus;  twisted loop in intestine
 intussusception;  indigitation;  invagination
 enteritis;  intestinal catarrh
 bowel disease;  intestinal disorder;  bowel ailment
 irritable bowel syndrome;  IBS
 Salmonella typhi (bacteria that causes typhoid fever)
 tympanites;  abdominal dropsy;  bloating of the abdominal region
 gut-brain connection;  gut-brain axis
 having one's guts twisted in anguish;  deep grief;  heartbroken thoughts
 vancomycin resistant enterococci;  VRE
 enterolith;  intestinal calculus
 well-functioning bowels;  good bowel movements
 vancomycin resistant enterococci;  VRE