how does menstruation occur
If pregnancy does not occur, the lining is released in what is known as menstruation. A number of problems with menstruation may occur. A lack of periods, known as amenorrhea, is when periods do not occur by age 15 or have not occurred in 90 days.Periods also stop during pregnancy and typically do not resume during the initial months of breastfeeding.enstruation, also known as a period or monthly, is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina.