At the same time, the lining of the uterus becomes thick to prepare a nesting place for a fertilized egg in the event that the girl becomes pregnant. About 2 weeks before a girl gets her period, the egg is released from the ovary this is called ovulation. The egg travels through the fallopian tube into the uterus. If the egg isn't fertilized by sperm, it starts to fall apart.
Then the lining and egg leave a girl's body as her period and the whole thing starts all over again — that's why we use the word "cycle. A girl's body may not follow an exact schedule. It's common, especially in the first 2 years after a girl starts getting her period, to skip periods or to have irregular periods.
Illness, rapid weight change, or stress can also make things more unpredictable. That's because the part of the brain that regulates periods is influenced by events like these. Going on a trip or having a major change in schedule can also make your period come at a different time than expected. All of this is perfectly normal.
It's also normal for the number of days a girl has her period to vary. Sometimes a girl may bleed for 2 days, sometimes it may last a week. That's because the level of hormones the body makes can be different from one cycle to the next, and this affects the amount and length of bleeding.
If your cycle is not regular, you'll want to pay attention to the clues your body may give you that your period is coming soon. These may include:. Keep some pads or tampons in your backpack or purse, just so you'll have them handy in case your period comes when you're not expecting it. You may even want to carry an extra pair of underwear. If the underlying cause is an eating disorder, treatment will often involve a combination of therapy and advice about your diet. Read more about treatment for eating disorders.
If doing a lot of exercise is thought to be the cause, you may be advised to do less and, if you're underweight, to increase your calorie intake. Read more about how to put on weight safely. If the underlying cause for your lack of periods cannot be treated, you should be able to get NHS therapy or counselling to help you come to terms with what this means for you.
Page last reviewed: 05 August Next review due: 05 August Possible causes of periods not starting Possible causes of periods not starting include: a normal delay in development — this often runs in families, so if your mother or sister started her periods late, this may be why your first period is delayed a hormonal imbalance being underweight doing a lot of exercise — this can affect girls who do lots of athletics, gymnastics or dance eating disorders severe stress pregnancy — it's possible to get pregnant before you get your first period as your ovaries can start releasing eggs a few months before your periods start a problem with the ovaries, womb or vagina Is there any treatment for periods that have not started?
It depends on what's causing the problem. One condition a health care provider may check for is called polycystic ovary syndrome. Irregular periods are a common symptom of this endocrine system disorder that leads to ovaries with many cysts, or fluid-filled sacs.
Other noticeable symptoms may include excessive hair growth and weight gain. In some elite athletes, such as gymnasts, runners and dancers, periods may stop due to high levels of physical activity coupled with inadequate caloric intake.
If that could be the case for your daughter, it must be addressed not only due to cessation of menstrual cycles, but also because it could affect her bone health and other aspects of healthy development. Doing a pregnancy test ensures a comprehensive assessment.
Whether she is sexually active or not, now would be a good time to encourage your daughter to be honest and forthcoming with her health care provider about topics such as sex, menstruation, birth control and other potentially sensitive issues. Emphasize that doing so can help her get the best health care possible.
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