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月経周期（げっけいしゅうき）とは、月経の開始日から次の月経が開始する前日までの日数のことである。この周期は、ホルモンの複雑な相互作用によって調節されている。
In an ovulatory menstrual cycle, the ovarian and uterine cycles are concurrent and coordinated and last between 21 and 35 days, with a population average of 27 ...
思春期に始まり（初経）、個人差はあるが、閉経時期までの間におよそ28日周期で起こり、通常3～7日間続く（正常月経周期：25日から38日）。月経と同時かその数日前から不快な症状 ...
The menstrual cycle is characterized by the rise and fall of hormones. Menstruation is triggered by falling progesterone levels, and is a sign that pregnancy ...
The menstrual cycle has three stages: the Follicular stage, Ovulation, and the Luteal (or premenstrual) stage. The cycle will stop if the woman gets pregnant ( ...
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) ...
Menstruation is the shedding of the uterine lining (endometrium). It occurs on a regular basis in uninseminated sexually reproductive-age females of certain ...
There are many cultural aspects surrounding how societies view menstruation. Different cultures view menstruation in different ways.
Menstrual synchrony · menstrual cycle onsets (the onset of menstruation or menses) becoming more synchronized together in time than when previously living apart.
The x-axis shows the time of the menstrual cycle in days. The time scale starts with the beginning (or "onset") of (last) menstrual period (LMP), ...