Vascular
Abdominal aortic aneurysm
Renal artery embolism
Renal vein thrombosis
Aortic dissection
Mesenteric ischemia
Renal
Pyelonephritis
Papillary necrosis
Renal cell carcinoma
Obstructive uropathy
May or may not be due to nephrolithiasis
Renal infarction
Renal hemorrhage
Ureter
Nephrolithiasis
Blood clot
Stricture
Tumor (primary or metastatic)
Bladder
Tumor
Varicose vein
Cystitis
GI
Biliary colic
Pancreatitis
Perforated peptic ulcer
Appendicitis (appendix may be pushed to RUQ in pregnancy)
Inguinal Hernia
Diverticulitis
Cancer
Bowel obstruction
Gynecologic
Ectopic Pregnancy
PID/TOA
Ovarian cyst
Ovarian torsion
Endometriosis
GU
Testicular torsion
Epididymitis
Other
Shingles
Lower lobe pneumonia
Retroperitoneal hematoma/abscess/tumor
Epidural abscess
Epidural hematoma
Rib contusion/fracture
Abdominal aortic aneurysm
Renal artery embolism
Renal vein thrombosis
Aortic dissection
Mesenteric ischemia
Pyelonephritis
Papillary necrosis
Renal cell carcinoma
Obstructive uropathy
May or may not be due to nephrolithiasis
Renal infarction
Renal hemorrhage
May or may not be due to nephrolithiasis
Nephrolithiasis
Blood clot
Stricture
Tumor (primary or metastatic)
Tumor
Varicose vein
Cystitis
Biliary colic
Pancreatitis
Perforated peptic ulcer
Appendicitis (appendix may be pushed to RUQ in pregnancy)
Inguinal Hernia
Diverticulitis
Cancer
Bowel obstruction
Ectopic Pregnancy
PID/TOA
Ovarian cyst
Ovarian torsion
Endometriosis
Testicular torsion
Epididymitis
Shingles
Lower lobe pneumonia
Retroperitoneal hematoma/abscess/tumor
Epidural abscess
Epidural hematoma
Rib contusion/fracture
Flank pain
Vascular
Hip pain
Abdominal aortic aneurysm
Hip pain 
Renal artery embolism
Ankle pain
Renal vein thrombosis