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.
The only symptom may be failure of conception.
It is usually associated with painless periods.
May be associated with DUB.
May be associated with premenstrual syndrome.