Polycystic ovarian syndrome, or PCOS is estimated to effect between five and 10 percent of women in their childbearing years. This condition is the result of a hormonal imbalance. PCOS disrupts the development of follicles and makes it more difficult for women to conceive. PCOS can cause infertility problems for our San Antonio, TX, patients, but there are other symptoms that women may develop as well. At the Fertility Center of San Antonio, our doctors help patients recognize common PCOS symptoms so that they know when it may be time to seek treatment. Irregular Periods Irregular periods are the most common symptom of PCOS.