What's is this disorder or disease?

Question

My sister has had her period for the longest time and she went to the doctor and they said she had something called POS. They told her a bit about it but they dint give her full details. She said it something about her uterus being too thick or something along the lines of that...i need a good answer please cause it may be hereditary. Thank You

Answer 1

PolyCystic Ovarian Syndrome.

It means she's got a few (or perhaps *many*) cysts on her ovaries, which can cause nasty troubles with periods and fertility.