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  2. Menstrual cycle - Wikipedia

    en.wikipedia.org/wiki/Menstrual_cycle

    Day one of the menstrual cycle is the first day of the period, which lasts for about five days. ... lasting around 14 days in women aged 18–24 compared with 10 days ...

  3. Ultradian rhythm - Wikipedia

    en.wikipedia.org/wiki/Ultradian_rhythm

    In chronobiology, an ultradian rhythm is a recurrent period or cycle repeated throughout a 24-hour day. In contrast, circadian rhythms complete one cycle daily, while infradian rhythms such as the menstrual cycle have periods longer than a day.

  4. Irregular menstruation - Wikipedia

    en.wikipedia.org/wiki/Irregular_menstruation

    Variation of 21 days or more is considered very irregular. [6] Alternatively, a single menstruation cycle may be defined as irregular if it is less than 24 days or more than 38 days. [7] If they are regularly shorter than 21 days or longer than 36 (or 35) days, the condition is termed polymenorrhea or oligomenorrhea, respectively. [8]

  5. What It Means If Your Period Came Early This Cycle - AOL

    www.aol.com/normal-length-cycle-could-anywhere...

    Everyone’s cycle looks different, so there could be a number of reasons behind why your period came early. A typical menstrual cycle is thought to last exactly 28 days—however, it can actually ...

  6. Menstruation - Wikipedia

    en.wikipedia.org/wiki/Menstruation

    The first day of menstrual bleeding is the date used for the last menstrual period (LMP). The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women, and 21 to 35 days in adults. [2] [3] The average length is 28 days; one study estimated it at 29.3 days. [10]

  7. Luteal phase - Wikipedia

    en.wikipedia.org/wiki/Luteal_phase

    Menstrual cycle. The menstrual cycle is on average 28 days in length. It begins with menses (day 1–7) during the follicular phase (day 1–14), followed by ovulation (day 14) and ending with the luteal phase (day 14–28). [1]

  8. Circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Circadian_rhythm

    Circadian: relating to biologic variations or rhythms with a frequency of 1 cycle in 24 ± 4 h; circa (about, approximately) and dies (day or 24 h). Note: term describes rhythms with an about 24-h cycle length, whether they are frequency-synchronized with (acceptable) or are desynchronized or free-running from the local environmental time scale ...

  9. Anovulatory cycle - Wikipedia

    en.wikipedia.org/wiki/Anovulatory_cycle

    While the normal human menstrual cycle typically lasts 4 weeks (28 days, range 24–35 days) and consists of a follicular phase, ovulation, and a luteal phase followed by either menstruation or pregnancy, the anovulatory cycle has cycle lengths of varying degrees.

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