The following are the features of anovulatory menstruation except

Anovulatory DUB is characterised by irregular cycles, short cycles with scanty flow or periods of amenorrhoea followed by prolonged and irregular bleeding  Usually due to alteration in the hypothalamic-pituitary axis.more common in extremes of reproductive life and in PCOS. unopposed oestrogen stimulation of the endometrium this Oestrogen withdrawal bleeding is characteristically painless irregular and prolonged, lacking the synchronous nature of normal menstruation.