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When do girls usually start getting menstrual periods?

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By age 15, 98% of teens have started their periods. If you’re not one of them, make an appointment to talk to your doctor. She can ask you and a parent about your family history, daily activity level, and examine you to figure out the causes for your delay. The reasons may be nothing to worry about. Or they could be a sign that you have a health condition that you need to treat.

From: Why No Period By Age 15? WebMD Medical Reference

SOURCES:

American College of Obstetricians and Gynecologists: “Menstruation in girls and adolescents: Using the menstrual cycle as a vital sign.”

Nemours Foundation: “All about menstruation.”

Stanford Children’s Health: “Amenorrhea in teens.”

Mayo Clinic: “Amenorrhea: Risk factors,” “Amenorrhea: Causes.”

National Institute of Child Health and Human Development: “What causes amenorrhea?” “Who is at risk of amenorrhea?”

Reviewed by Renee A. Alli on December 15, 2017

SOURCES:

American College of Obstetricians and Gynecologists: “Menstruation in girls and adolescents: Using the menstrual cycle as a vital sign.”

Nemours Foundation: “All about menstruation.”

Stanford Children’s Health: “Amenorrhea in teens.”

Mayo Clinic: “Amenorrhea: Risk factors,” “Amenorrhea: Causes.”

National Institute of Child Health and Human Development: “What causes amenorrhea?” “Who is at risk of amenorrhea?”

Reviewed by Renee A. Alli on December 15, 2017

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Can very low weight delay a girl's first period?

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