If you don't get your period every month as expected or don't get your first period by the time you are 15, it is called amenorrhea.
Amenorrhea can happen for many reasons. Sometimes it's caused by a problem with the reproductive organs or another medical problem. Other times it's caused by doing hard exercise for long periods of time. It can also happen if you don't eat well or if you diet too much or have an eating disorder. Pregnancy and certain types of birth control can also delay your periods.
Your doctor will want to find out why your period hasn't started. You may need to make some diet and exercise changes. These may help start your period. Or you may need treatment for another problem.
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.
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.
Causes of primary amenorrhea include:
Watch closely for changes in your health, and be sure to contact your doctor if:
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