text: how do you know if you have an ovarian cyst? regularly missed periods for months at a time, not sexually active, dull and constant pain in the lower right abdomen. pain sometimes worsens to an incredibly uncomfortable point. have you ever been tested for pcos? it can cause cyst and missed periods. about 5 to 10% of women have it and is the most common hormonal reproductive problem in women of childbearing age. pelvic pain and infrequent menstrual periods are a symptom. you should do to a gyno and find out what is going on. if its just a cyst they may put you on the pill to get it to leave, and to make you have a period every month so that you will not have any more.  links about pcos: http://www.pcosupport.org/medical/whatis.php http://www.webmd.com/hw/womens_conditions/tw9104.asp