What is menstruation?
Every month or so, the lining of your womb gets thick with blood and tissue to prepare to receive a fertilized egg incase you become pregnant. If no egg is fertilized, then that lining is released out of your body as blood through the vagina. This monthly flow is called menstruation or a period and is a normal, healthy part of a woman’s life. It usually begins when a girl is between 9 and 16 years old and continues until she is 45 to 55.