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