What can I do to prevent menstrual irregularities?

For some women, use of birth control pills can help regulate menstrual cycles. Treatment for any underlying problems, such as an eating disorder, also might help. However, some menstrual irregularities can't be prevented.

In addition, consult your health care provider if:

• Your periods suddenly stop for more than 90 days — and you're not pregnant
• Your periods become erratic after having been regular
• You bleed for more than seven days
• You bleed more heavily than usual or soak through more than one pad or tampon every hour or two
• Your periods are less than 21 days or more than 35 days apart
• You bleed between periods
• You develop severe pain during your period
• You suddenly get a fever and feel sick after using tampons

If you have questions or concerns about your menstrual cycle, talk to your health care provider.