Why does my pelvic area hurt?

Many possibilities. Pelvic pain is one of the most common gyn complaints and can have a wide variety of causes, ranging from PID to an ovarian cyst to appendicitis to endometriosis. This is definitely something to get checked out with your gyn doc right away.
Many Pelvic Pains. Many pelvic pains continuing the list.... Urinary bladder interstitial cystitis, pelvic inflammatory disease, scarring, an old fall with sacral or coccyx injury, childbirth, stepping off a curb funny, jamming on the brake pedal at impact, hip pain, sacroiliac pain, sexually transmitted diseases, hormone imbalances, dryness, prolapsed organs, painful sex... Men: prostatitis... You get the idea...