Irregular Periods: There are many reasons why a woman may miss her period, or why periods might stop altogether. Most women have a period every 28 days, but slightly shorter or longer cycles are common (from 21 to 40 days). See your GP if you’ve missed more than three periods in a row.
Pregnancy: Pregnancy is a common reason why periods unexpectedly stop. It can sometimes happen if the contraception you’re using fails. It might be that your period is simply late, so you could wait a few days to see if it arrives.
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If it doesn’t arrive, you can do a pregnancy test. It’s important to be aware that you can get pregnant in the days after your period is normally due. This can happen if the release of an egg (ovulation) is delayed.
If you’re stressed, your menstrual cycle can become longer or shorter, your periods may stop altogether, or they might become more painful. Try to avoid becoming stressed by making sure you have time to relax. Regular exercise can help you relax. Breathing exercises can also help. If you’re finding it hard to cope with stress, a talking therapy called, cognitive behavioral therapy (CBT) may be recommended.
Sudden weight loss:
Excessive or sudden weight loss can cause your periods to stop. Severely restricting the number of calories you eat stops the production of hormones needed for ovulation.
Your GP may refer you to a dietitian if you’re underweight, where you have a body mass index (BMI) of less than 18.5. The dietitian will be able to advise you about how to regain weight safely. If your weight loss is caused by an eating disorder, such as anorexia, you’ll be referred to a psychiatrist.
Being overweight or obese:
Being overweight or obese can also affect your menstrual cycle. If you’re overweight, your body may produce an excess amount of estrogen, one of the hormones that regulate the reproductive system in women.
The excess estrogen can affect how often you have periods, and can also cause your periods to stop. Your GP may refer you to a dietitian if you have a BMI of 30 or more, and it’s affecting your periods. The dietitian will be able to advise you about losing weight safely.
The stress that intense physical activity places on your body can affect the hormones responsible for your periods. Losing too much body fat through intense exercise can also stop you from ovulating. You’ll be advised to reduce your level of activity if excessive exercise has caused your periods to stop. If you’re a professional athlete, you may benefit from seeing a doctor who specializes in sports medicine. (source: nidirect)