What is the pelvis?

http://www.patient.co.uk/health/pelvic-pain-in-women

The pelvis is the lowest part of your abdomen. Organs in the pelvis include the bowel, bladder, womb and ovaries. Pelvic pain usually means pain that originates from one of these organs. In some cases the pain comes from the pelvic bones that lie next to these organs, or from nearby muscles, nerves, blood vessels or joints. So, there are many causes of pelvic pain.

Pelvic pain is more common in women than in men.