Polycystic Ovarian Syndrome (PCOS) is an endocrine disorder that is thought to affect nearly 20% of all females in the world (1 in 5 women).  It is a cluster of complicated symptoms that are not the same for every woman.  Women can also have symptoms but may not necessarily have cysts on their ovaries.  It is believed to be fundamentally caused by insensitivity to the hormone insulin.