Polycystic ovarian syndrome (PCOS) is a disorder that results in abnormal hormone levels in a woman. In a normal ovary, a single egg develops and is released during ovulation each month. A polycystic ovary will have many eggs that are never released.
Polycystic ovarian syndrome often begins with puberty and worsens with time. The cause of PCOS has not yet been completely identified. The symptoms of PCOS are related to an excess of the hormone androgen. This hormone can cause male features such as facial hair and male-pattern baldness in women. Polycystic ovaries may be normal in size, or they may be enlarged, with smooth, thick coverings.
The exact cause of PCOS is not clear. Some of the possible causes include:
The risk of PCOS increases in women who also have one of these conditions: