http://www.inboxrobot.com/news/amenorrheaConstantly updated news and information about a variety of topics. http://www.inboxrobot.com/news.php?fid=184924248 25 Aug 2008 20:12 GMT ... my period late?" Although, pregnancy is the most common cause of absence of menstruation (amenorrhea), many times, the women will also assure me that they are definitely not pregnant. ... http://www.inboxrobot.com/news.php?fid=184889661 25 Aug 2008 16:07 GMT ... my period late?" Although, pregnancy is the most common cause of absence of menstruation (amenorrhea), many times, the women will also assure me that they are definitely not pregnant. ...