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Related Concept Videos

Signs of Puberty01:27

Signs of Puberty

Puberty is a critical phase, typically beginning between the ages of 8 and 13 in girls and 9 and 14 in boys, though timing can vary based on genetics, environmental factors, and overall health. This period is characterized by the development of secondary sexual characteristics and the attainment of reproductive potential. Endocrine changes underpin puberty, with hormonal surges of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) instigated by Gonadotropin-Releasing Hormone (GnRH)...
Hormonal Regulation of the Menstrual Cycle01:22

Hormonal Regulation of the Menstrual Cycle

The ovarian cycle regulates endometrial changes throughout a single menstrual cycle via the coordinated action of gonadotrophin-releasing hormone (GnRH) and gonadotrophins.
At puberty, GnRH begins a pulsatile release pattern, which triggers the anterior pituitary gland to secrete follicle-stimulating hormone (FSH) and luteinizing hormone (LH). The frequency and amplitude of GnRH pulses vary across the menstrual cycle, with faster pulses favoring LH release and slower pulses favoring FSH release.
Disorders of the Female Reproductive System01:24

Disorders of the Female Reproductive System

The female reproductive system can be affected by several disorders, including Premenstrual Syndrome (PMS), Premenstrual Dysphoric Disorder (PMDD), endometriosis, and various forms of cancer. PMS and PMDD are cyclical conditions that cause physical and emotional distress, with symptoms that include edema, mood swings, and food cravings. PMDD is a more severe form of PMS characterized by increased symptom severity that peaks during the luteal phase and tends to improve or resolve shortly after...
Menopause01:28

Menopause

Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
Menses Phase01:18

Menses Phase

The uterine cycle begins with the menstrual phase, which is considered day one of the cycle and typically lasts about five days. This phase is characterized by the degeneration and shedding of the stratum functionalis, the functional layer of the endometrium.
When fertilization does not occur, the corpus luteum deteriorates, causing a significant drop in the levels of estrogen and progesterone in the body. This hormonal decrease triggers the release of prostaglandins, which cause the uterine...
Hormonal Control of the Ovarian Cycle01:30

Hormonal Control of the Ovarian Cycle

The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
Before puberty, the hypothalamus releases GnRH in a low frequency, low amplitude pulsatile manner. This along with the immature hypothalamic-pituitary-gonadal axis activity, results in low estrogen levels and the absence of a fully functional ovarian cycle.  At puberty, GnRH secretion increases in both frequency and...

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Related Experiment Video

Updated: Jun 17, 2026

Herbs-Partitioned Moxibustion on the Navel in a Rat Model of Primary Dysmenorrhea with Cold Coagulation and Blood Stasis
05:36

Herbs-Partitioned Moxibustion on the Navel in a Rat Model of Primary Dysmenorrhea with Cold Coagulation and Blood Stasis

Published on: October 4, 2024

Menstrual disturbances in puberty.

Efthimios Deligeoroglou1, Pandelis Tsimaris

  • 1Division of Pediatric - Adolescent Gynecology & Reconstructive Surgery, 2nd Dept Ob/Gyn University of Athens, Aretaieion Hospital 76, Vas. Sophias Av. (115 28) Athens, Greece. edeligeo@aretaieo.uoa.gr

Best Practice & Research. Clinical Obstetrics & Gynaecology
|December 26, 2009
PubMed
Summary
This summary is machine-generated.

Menstruation onset typically occurs around 12-13 years in girls. Delayed puberty, precocious puberty, and amenorrhoea can arise from various hormonal and anatomical issues, impacting adolescent reproductive health.

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Determination of Reproductive Competence by Confirming Pubertal Onset and Performing a Fertility Assay in Mice and Rats
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Determination of Reproductive Competence by Confirming Pubertal Onset and Performing a Fertility Assay in Mice and Rats

Published on: October 13, 2018

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Last Updated: Jun 17, 2026

Herbs-Partitioned Moxibustion on the Navel in a Rat Model of Primary Dysmenorrhea with Cold Coagulation and Blood Stasis
05:36

Herbs-Partitioned Moxibustion on the Navel in a Rat Model of Primary Dysmenorrhea with Cold Coagulation and Blood Stasis

Published on: October 4, 2024

Determination of Reproductive Competence by Confirming Pubertal Onset and Performing a Fertility Assay in Mice and Rats
06:38

Determination of Reproductive Competence by Confirming Pubertal Onset and Performing a Fertility Assay in Mice and Rats

Published on: October 13, 2018

Area of Science:

  • Gynecology
  • Pediatric Endocrinology

Background:

  • Menarche, the onset of menstruation, usually occurs between 12 and 13 years of age in adolescent girls.
  • Variations in pubertal development include precocious puberty (early onset) and delayed puberty (absence by age 14).
  • Amenorrhoea, the absence of menstruation, stems from diverse causes including anatomical defects and hormonal imbalances.

Purpose of the Study:

  • To review the common causes and presentations of menstrual irregularities in adolescent girls.
  • To highlight the significance of abnormal uterine bleeding (AUB) and dysmenorrhoea as urgent and frequent gynecological concerns.

Main Methods:

  • Review of literature on adolescent menstrual disorders.
  • Categorization of amenorrhoea causes: hypogonadotrophic hypogonadism, hypergonadotrophic hypogonadism, hyperprolactinaemia, and hypothalamic dysfunction due to stress.
  • Identification of AUB and dysmenorrhoea as key adolescent gynecological issues.

Main Results:

  • Amenorrhoea can result from hypogonadotrophic hypogonadism (impaired gonadotrophin secretion), hypergonadotrophic hypogonadism (poor ovarian response), hyperprolactinaemia, and stress-induced hypothalamic dysfunction.
  • Abnormal uterine bleeding (AUB), particularly dysfunctional uterine bleeding (DUB), represents a critical gynecological emergency in adolescence.
  • Dysmenorrhoea is the most prevalent gynecological complaint leading to medical consultation among adolescents.

Conclusions:

  • Understanding the spectrum of menstrual irregularities, from precocious to delayed puberty and amenorrhoea, is crucial for adolescent health.
  • Prompt diagnosis and management of conditions like AUB and dysmenorrhoea are essential for addressing urgent and frequent gynecological problems in adolescent girls.