| Abdominal causes |
| Gastrointestinal |
- Appendiceal neoplasm
- Gastroenteritis (Salmonella, Yersinia, Campylobacter)
- Mesenteric adenitis
- Omental torsion
- Constipation
- Perforated ulcer
- Intussusception
- Small bowel obstruction
- Crohn disease
- Meckel diverticulitis
- Cecal diverticulitis
- Typhlitis
- Pancreatitis
|
| Gynecological |
- Ectopic pregnancy
- Pelvic inflammatory disease
- Ruptured ovarian follicle or cyst (Mittelschmerz)
- Ovarian torsion
|
| Obstetrical |
- Placental abruption
- Uterine rupture
- Labor
- Severe preeclampsia and HELLP syndrome (midline or right upper quadrant pain)
- Intraamniotic infection
- Round ligament pain
|
| Genitourinary |
- Testicular torsion
- Nephritis
- Urinary tract infection
- Renal colic (stone, ureteropelvic junction obstruction)
|
| Other |
- Sickle cell crisis
- Mesenteric adenitis
- Primary peritonitis
|
| Extra-abdominal causes |
- Pneumonia
- Hemolytic uremic syndromes
- Diabetic ketoacidosis
- IgA vasculitis (previously Henoch-Schönlein purpura)
- Streptococcal pharyngitis
|
