The Heavy Painful Menstrual Cycles is a hormonal change taking place in woman's body. The hormones estrogen and progesterone play a key role in regulating menstrual cycle. Each month, these changes prepare woman's uterus for possibility of pregnancy. An endometrium, a thin layer of lining inside uterus developed naturally by estrogen. This formation of an endometrium is an ideal environment for fertilization of eggs. When there are no fertilized eggs, the estrogen and progesterone levels drop down. As a result the lining of uterus sheds through vagina. This is when a menstrual period starts.
The onset of first ever menses is called as menarche, whereas menopause is the time when menstrual periods stop forever. Normally, the menstrual period starts from early teenage years i.e. 11-14 years and lasts till the age of 45-55 years.
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