A period is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. It occurs monthly and an average cycle can last between 3 to 6 days
This occurs when a woman's body releases tissue it no longer needs. This tissue comes from the uterus, which is where a baby (fetus) can develop in the female body. Every month or so, the uterus lining gets thicker to prepare for a fertilized egg if the woman becomes pregnant. If the egg doesn't get fertilized, that lining is released from the blood.
The menstrual cycle happens due to the rise and fall of hormones. This cycle results in the thickening of the lining of the uterus, and the growth of an egg, (which is required for pregnancy). The egg is released from an ovary around day fourteen in the cycle, the thickened lining of the uterus provides nutrients to an embryo after implantation. If pregnancy does not occur, the lining is released in the form of blood which we call as menstruation.
It starts when a girl reaches puberty around the age of 10 to 14 years and stops around the age of 45 and that phase is known as menopause.
Puberty is the time in life when a boy or girl becomes sexually mature. It is a process that usually happens between ages 10 to14 for girls and ages 12 to16 for boys. It causes physical changes, and affects boys and girls differently.
The day count for menstrual cycle begins on the first day of menstruation when blood starts to come out of the vagina. In this section, on an average it is between 27-29 days.It may vary for different women but that should be consistent every month.