Reviewed by Varnada Karriem-Norwood on June 21, 2012

Sources

Laura Corio, MD. Ob-Gyn, NYU Medical Center

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Video Transcript

Narrator: What is a normal menstrual cycle for a girl under 18?

Laura Corio, MD, Ob-Gyn: You know when a girl starts menstruating, just like our perimenopausal girls, the adolescent teenager can have irregular cycles up to three years after she starts her period, but hopefully once she gets out of the irregular cycles, a normal menstrual cycle is between 21 to 35 days, and usually bleeding somewhere between 4 to 7 days.

Narrator: Heavy bleeding, light bleeding, does it matter?

Laura Corio, MD, Ob-Gyn: I always tell the girls that if their cycles are heavier than a pad an hour, or they are passing clots, or their bleeding extends longer than 7 days that they should call the gynecologist.