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How long does a period last?

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Your first period may last from two to seven days. Then, there might be 21 to 40 days or even longer before you have another period. Your next period might be heavier or lighter than the first. Don't worry if your early periods have longer cycles or don't follow a schedule. This irregularity is normal for at least the first two years. Your periods should become more regular within two years after you start menstruating. Some teens have a 28-day cycle; some have a 24-day cycle; others have a 30- to 34-day cycle. All of these are normal. For young teens, cycles can range from 21 to 45 days. For adults, it can be 21-35 days. If your period is much shorter or longer, or if your period does not become regular after two years, see your primary health care provider. It is possible to skip a month, especially if you have been ill or under stress.

From: All About Menstruation WebMD Medical Reference

SOURCES: 

Iwannaknow.org: "Puberty." 

WebMD Medical Reference:  .  Normal Menstrual Cycle

Cool Nurse.com:  "What You Need to Know About Menstruation."

American College of Obstetricians and Gynecologists: "Especially for Teens: Menstruation." 

The National Women's Health Information Center: "Menstruation and the Menstrual Cycle."

Tampax: Usage questions: "Can I use a tampon overnight?"

Reviewed by Dan Brennan on April 18, 2019

SOURCES: 

Iwannaknow.org: "Puberty." 

WebMD Medical Reference:  .  Normal Menstrual Cycle

Cool Nurse.com:  "What You Need to Know About Menstruation."

American College of Obstetricians and Gynecologists: "Especially for Teens: Menstruation." 

The National Women's Health Information Center: "Menstruation and the Menstrual Cycle."

Tampax: Usage questions: "Can I use a tampon overnight?"

Reviewed by Dan Brennan on April 18, 2019

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THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.

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