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Causes Of Irregular Periods

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Dear BeingGirl Experts,

I am a bit embarrassed to talk to my mom about this so: How come I might get my period every 20 days, and then not get it again for like 30?




Dear Melissa,

First periods are often very irregular. Keeping a private calendar and marking it when you have your period is a smart idea. This will help you keep up with your period. You count from the first day of your period to the first day of your next period to determine how many days your cycle is. Your period probably won’t come on the same date each month. Teen girls are often a surprised by this. You may find your menstrual cycle lasts 28 days, others might have a 24-day cycle, a 30-day cycle, or even longer. After you start your first period, menstrual cycles last 21–45 days. After a few years, cycles usually shorten to an adult length of 21–34 days and become more regular.


Periods average 3–7 days. It often takes several years for a predictable cycle to develop, so be understanding of the time this requires. Your mother is your resident expert, and can help you better understand what to expect if you ask.


Hope this is helpful,

Your BeingGirl Experts

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comments so far
Posted March 29, 2014
I'm on my first period right now. On the first day 3/12/14) it was super heavy. Today its pretty Light.
Posted July 04, 2013
I am eighteen and have NEVER had periods that are one month apart except for a few occasions early in puberty. Most of my periods are 2 to 4 months apart, and last for way over a week- I had one that lasted an entire month, once. I am very healthy, so if your periods are only kind of irregular like that, you're chill.
Posted May 08, 2012
My first period was April 6th. I didn't think I would be regular, but I got my second period yesterday. My menstural cycle was 31 days long. I thought I wouldn't get it until three months later because that's what happened to my mother. But I drank a lot of lemonade and juice with pulp in it over the weekend and my grandma says that pulp makes you regular. Is this true?
1032 atlanta dr
1032 atlanta dr
Posted July 19, 2012
I get mine between 58 and 72 days and I've only had like 8 periods in the past 2years and I don't know what's up with that and when I get it I barely have cramps and it's heavy
Posted June 18, 2012
I'm 14 and this is my 7th period. (I'm on it now (; ) and it was very irregular! I started my first period I think last year... Can't remeber which month becuz my I got my 7th after 7 months! I was freaking out but now I'm hating life! I have to worst cramps, headaches, and mood swings.. Can't wait till it is over!!


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