What is primary amenorrhea?

The menstrual cycle is the series of changes in the body to prepare for a possible pregnancy. Menstruation most often begins between the ages of 11 and 15.

If you haven't had a first period by age 15, it's called primary amenorrhea. This is different from infrequent or light menstrual cycles, which are very common in teens, particularly in the first couple of years after menstruation begins. Primary amenorrhea is also different than if you start having periods, but then stop having periods for at least 3 cycles.

You can still become pregnant even though you aren't menstruating. Practice birth control if you don't want to become pregnant.

Treatment depends on the cause. If the cause is a physical problem, such as imperforate hymen, then you may have surgery. For other causes, your doctor may prescribe hormone therapy to help control your cycle. It can also help protect your bones. Your doctor also may prescribe calcium supplements for bone health.

• Eat a healthy, balanced diet. Include fruits, vegetables, whole grains, proteins, and low-fat dairy products.
• Stay at a healthy weight. Ask your doctor what a healthy weight is for you.
• Get regular exercise. But don't do hard, long exercise. Ask your doctor how much is too much.