- Perforated colorectal cancer
- Infectious colitis, eg, Campylobacter, C. difficile
- Inflammatory bowel disease
- Intestinal ischemia
- Gynecologic: pelvic inflammatory disease, tubo-ovarian abscess, ovarian torsion, ruptured ectopic pregnancy or ovarian cyst, mittelschmerz, endometriosis
- Urinary calculus
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