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Ovulation is the release of eggs from the ovaries, which occurs midway through the menstrual cycle and is controlled by hormones. Learn about the follicular and luteal phases, the anatomy and physiology of ovulation, and the factors affecting fertility.
Learn about the menstrual cycle, a series of natural changes in hormone production and the structures of the female reproductive system that makes pregnancy possible. The cycle consists of the ovarian cycle and the uterine cycle, each with different phases and events, such as ovulation, menstruation, and premenstrual syndrome.
The mean menstrual cycle length was 30.5 days (SD = 4.56). [4] Based on the mean cycle length of the women in this study, the expected difference by chance in menstrual cycle onset was approximately 7.5 days. The mean difference in cycle onset was calculated for the beginning, middle, and end of the study for the pairs and triples of women.
Menstruation, or a period, is the regular discharge of blood and mucosal tissue from the uterus through the vagina. It is triggered by falling progesterone levels and is a sign of non-pregnancy. Learn more about the length, duration, bleeding, and hormonal changes of menstruation.
Mittelschmerz is a term for lower abdominal pain that occurs mid-cycle, often alternating sides. It may be caused by follicular swelling, ovarian wall rupture, fallopian tube contraction, or irritation.
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Learn about the history, terminology and effectiveness of the rhythm method and other calendar-based methods of estimating fertility. The rhythm method is a type of natural family planning that tracks menstrual cycle length and avoids intercourse on fertile days.
The luteal phase is the second half of the menstrual cycle, lasting about 14 days from ovulation to the next period. It involves changes in hormone levels, endometrial lining, corpus luteum, and possible pregnancy.
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