• Gastroenteritis or colitis
  • Gynecologic: pelvic inflammatory disease, tubo-ovarian abscess, ovarian torsion, ruptured ectopic pregnancy or ovarian cyst, mittelschmerz, endometriosis
  • Urologic: testicular torsion, acute epididymitis
  • Urinary calculus
  • Pyelonephritis
  • Diverticulitis
  • Meckel's diverticulitis
  • Carcinoid of the appendix
  • Perforated colon cancer
  • Crohn's ileitis
  • Perforated peptic ulcer
  • Cholecystitis
  • Mesenteric adenitis
  • Typhlitis (neutropenic colitis)
  • Parasites, e.g., ascariasis

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