II. Causes: Gastrointestinal
- Early Appendicitis (later radiates to right lower quadrant)
- Gastritis or Peptic Ulcer Disease
- Small Bowel Obstruction or mass
- Umbilical Hernia
III. Causes: Vascular
- Abdominal Aortic Dissection
- Mesenteric Ischemia
- Ruptured Abdominal Aortic Aneurysm