Pelvic origin
Acute cystitis
Ectopic
Ovarian torsion
Endometriosis
Pelvic inflammatory disease<unk> 
Ectopic pregnancy
Ovarian torsion
Spontaneous abortion
Septic abortion
Myoma (degenerating)
Ovarian cyst (rupture)
Tubo-ovarian abscess
Mittelschmerz
Sexual assault/trauma
Ovarian hyperstimulation syndrome
Vaginitis (e.g. trichomoniasis, candidiasis)
Urethritis (e.g. N. gonorrhoeae/Chlamydia)
Abdominal origin
Appendicitis
Kidney stone
Psoas abscess
Mesenteric adenitis
Incarcerated hernia
Diverticulitis
Pyelonephritis
Cervicitis
Pelvic origin
Appendicitis 
Acute cystitis
Appendicitis
Ectopic
Uvulitis
Ovarian torsion