For most women it’s a fairly predictable event that is easily incorporated into daily life. And then there are others-- about 30% of women-- who experience periods that are not predictable and cause major disruption, not only to daily life but to special events, vacations, etc..

That said, irregular periods occur normally at certain times during a woman’s lifetime. When the period starts, typically between 10 and 15 years old, it can take several years to become established as a regular pattern. Of course, menstruation also stops during pregnancy and often remains suppressed during breast-feeding as well. Finally, irregular periods also occur leading up to the time of menopause.

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