Infrequent MENSTRUATION.
Dysmenorrhoea (painful periods) is the most common type of menstrual disorder. Other types of menstrual disorder are amenorrhoea (absence of menstruation), polymenorrhoea (too frequent menstruation), oligomenorrhoea (infrequent periods or scanty blood loss), and menorrhagia (excessive bleeding).
Some women have extreme variations in the length of menstrual cycles or menstrual periods, or in the amount of blood lost (see menstruation, irregular).... menstruation, disorders of
mental1 adj. relating to or affecting the mind.
mental2 adj. relating to the chin.... menstruation