Why am i missing my periods. i started my period at the age of 13. i have been missing my period a few months at a time and i was wondering what this could be?

Within : Within the first 2-3 years of starting a period, a young woman may not have regular monthly ovulations which can lead to an irregular period. You may have a period, and then it could be many months before the next one. This is completely normal and nothing for you to worry about. Over the next few years, your period will become more regular. If it has been 3 years since starting a menstrual cycle, there are other reasons besides pregnancy that can cause a woman to miss a period such as: stress, diet, excessive exercise or a hormone imbalance such as with a thyroid disorder or polycystic ovarian syndrome. If you have had your period for more than 3 years and are still worried about an irregular cycle, give your doctor a call. Your doctor will take a thorough history and physical and may run some tests to find out why your period is irregular. Often your period can be regulated by using hormonal birth control such as the pill or Depo-Provera shot (and you'll be protected against pregnancy!). Good luck!