|Amenorrhea is the term used to describe the condition where menstrual periods are absent. When you miss a period, your first thought may be that you are pregnant. However there are actually several factors that may cause or contribute to the absence of menstruation.
Menstruation refers to the shedding of the lining of the uterus (the endometrium) each month, and it is also commonly known as the menstrual period.
Menstrual periods usually last for five to seven days. In order for a woman to have regular menstrual cycles, her hypothalamus, pituitary gland, ovaries and uterus must be functioning properly. Her cervix and vagina must also be structured normally to allow for menstrual blood to pass through.