PCOS is an ovarian disorder characterised by hyperandrogenism, ovulatory dysfunction and polycystic ovaries. Clinically, the ovulatory dysfunction often presents as oligo/amenorrhoea, although menorrhagia is not uncommon.PCOS can present as heavy menstrual bleeding in adolescent girls because of the associated endometrial thickening caused by unopposed anovulatory hyper-oestrogenism