Endometriosis, ovarian cysts, and sudden loss of circulation to the ovaries all are culprits of pain in this area. Eating an adequate amount of vitamins help your bones.
One should not try to determine a reason for pelvic pain without checking with their doctor. Endometriosis can be a cause, and this should be diagnosed by a physician.
If you are experiencing any type of unexplained pelvic pain, then you need to go see your gynocologist as soon as possible. You could have an infection or cancer.