"Older women are at highest risk. About two-thirds of the deaths from ovarian cancer occur in women age 55 and older. About 25% of ovarian cancer deaths occur in women ages 35 - 54."
There are rare cases of ovarian carcinoma in women under age 30.
But if your ultrasound showed no ascites and no sign of an ovarian mass - your bloating, constipation, fatigue, and back pain should not be caused by an ovarian cancer.
A cancer large enough to cause those symptoms should be easily visualized on a pelvic ultrasound.
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Causes of dyspareunia (pain with intercourse) include the following : " endometriosis, pelvic inflammatory disease, uterine prolapse, retroverted uterus, uterine fibroids, cystitis, irritable bowel syndrome, hemorrhoids and ovarian cysts." This is from a Mayo Clinic review - http://www.mayoclinic.com/health/painful...
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Since you are worried it would be a good idea to go back to your gynecologist for a discussion of your concerns.
That may give you the reassurance you need.