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Menstrual cycle: What's typical, what's not

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By Mayo Clinic Staff

Do you know when your last menstrual period began or how long it lasted? If not, it might be time to start paying attention.

When you track your menstrual cycles, you learn what's typical for you. You also can note when you ovulate and spot important changes, such as a missed period or unusual bleeding. Most changes aren't serious, but sometimes changes can signal a health issue.