PCOS (Polycystic Ovarian Syndrome) refers to a condition caused by hormonal imbalances. Women suffering from PCOS produce higher than normal amounts of male hormones. This affects ovulation and can result in irregular periods. In some cases, women suffering from PCOS may have irregular periods. This, in turn, can make it harder for these women to conceive. In fact, PCOS is one of the most common causes of female infertility.