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  1. Menstruation - Wikipedia

    Menstruation is the most visible phase of the menstrual cycle and its beginning is used as the marker between cycles. The first day of menstrual bleeding is the date used for the last menstrual period …

  2. Menstrual Cycle (Normal Menstruation): Overview & Phases

    Your menstrual cycle begins on the first day of your period. Your cycle prepares your body for a possible pregnancy. The average cycle lasts between 24 and 38 days.

  3. What is Menstruation? | Get Facts About Having Your Period

    Menstruation — aka having your period — is when blood and tissue from your uterus comes out of your vagina. It usually happens once every month.

  4. Period Symptoms and Signs: Normal, and When to See a Doctor

    Mar 25, 2019 · What is a normal menstrual cycle? Your period — and the PMS symptoms that can accompany it — is just one part of your monthly menstrual cycle.

  5. Menstrual cycle: What's normal, what's not - Mayo Clinic

    Apr 22, 2023 · What's typical? The menstrual cycle is counted from the first day of one period to the first day of the next. The cycle isn't the same for everyone. Menstrual bleeding might happen every 21 to …

  6. Period.org | Home

    Our mission is strong, our momentum is growing, and our commitment to ending period poverty has never been clearer. Help us welcome Jennifer as we step confidently into a strong and energizing …

  7. PERIOD Definition & Meaning - Merriam-Webster

    period, epoch, era, age mean a division of time. period may designate an extent of time of any length. epoch applies to a period begun or set off by some significant or striking quality, change, or series of …

  8. Menstruation | Period | MedlinePlus

    Jan 11, 2026 · Menstruation (or period) happens monthly. As the uterus sheds its lining, vaginal bleeding follows. Menstrual blood is made of blood and tissue.

  9. Menstruation (Menstrual Cycle): Phases, What’s Normal

    Sep 4, 2025 · Menstruation is period bleeding, which is casually referred to as “having your period.” This happens monthly (for most females) during your fertile years, except during pregnancy.

  10. Your menstrual cycle - Office on Women's Health

    Jan 13, 2025 · A menstrual cycle begins with the first day of your period, or menstruation [MEN-stroo-AY-shuhn] and starts over again when the next period begins. Throughout a monthly menstrual …