Understanding Periods

Having a period is a normal, healthy part of becoming and being a woman. A period is the result of a cycle that takes place inside a girl’s body. This menstrual cycle makes it possible for women to have babies. The cycle begins with ovulation, when an egg is released and begins its journey.

An Egg Is Released

• During each cycle, one egg grows and is released from an ovary. It finds its way to the fallopian tube.

The Egg Travels Through a Tube

• The egg moves through the fallopian tube toward the uterus. (If the egg and a man’s sperm meet here, a woman becomes pregnant.)

The Lining Thickens

• The lining of the uterus grows thicker. This lining is made up of blood, tissue, and fluid. (The lining will nourish a growing baby during pregnancy.)

The Egg and Lining Are Shed

• About once a month, the egg and the lining of the uterus are shed through the vagina. This is called a period. (A period does not happen during pregnancy.)