A 20 year old woman gives a history of sharp pain in the lower abdomen for 2-3 days every month approximately 2 weeks before the menses: The most probable etiology for her pain is
Mittelschmerz - Midcycle ovulatory pain occurs during oocyte release from an ovarian follicle and thus produces lateral pain that migrates from one side to the other from month to month.
Cyclic causes - include primary dysmenorrhea in which periods are painful but no pelvic pathology
a. Secondary dysmenorrhea due to endometriosis, adenomyosis, or perhaps chronic salpingitis
b. Gynecological causes of continuous pain include - later stages of endometriosis, adenomyosis, uterovaginal prolapse, and chronic salpingitis or pelvic adhesions
c. Ovarian remnant syndrome - occurs after oophorectomy when residual ovarian tissue is trapped in a retroperitoneal location.