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Menopause

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...

Hormonal Regulation of the Menstrual Cycle

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.

Signs of Puberty

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 Control of the Ovarian Cycle

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...

Major Hormones and Their Functions

Major Hormones and Their Functions

Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and lactation.

The Menstrual Cycle

The Menstrual Cycle

The menstrual cycle is a recurrent sequence of changes in the uterine endometrium, specifically its functional layer, the stratum functionalis. This cycle prepares the uterus for potential pregnancy. This cycle typically spans 21–35 days, averaging 28 days, and aligns with the ovarian cycle, regulated by fluctuating levels of ovarian hormones, primarily estrogen and progesterone.
The menstrual phase occurs from days 1 to 5 and involves the shedding of the stratum functionalis, as a uterine...

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Related Experiment Video

Updated: Jun 18, 2026

Exploring Independent Effects of Follicle-Stimulating Hormone In Vivo in a Mouse Model

Exploring Independent Effects of Follicle-Stimulating Hormone In Vivo in a Mouse Model

Published on: August 11, 2023

Hormone changes associated with the menopausal transition.

H I Su¹, E W Freeman

¹Department of Reproductive Medicine, University of California, San Diego, CA, USA.

Minerva Ginecologica

|November 28, 2009

Summary

This summary is machine-generated.

The menopausal transition (MT) involves hormonal shifts, with anti-Mullerian hormone (AMH) changing first, followed by follicle-stimulating hormone (FSH) and inhibin B. Estradiol decreases later, but no hormone levels currently predict MT or final menstrual period (FMP).

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Area of Science:

Reproductive endocrinology
Women's health
Aging research

Background:

The menopausal transition (MT) is a critical period preceding the final menstrual period (FMP), marked by altered bleeding and hormone profiles.
Understanding hormonal changes during MT is key to characterizing late reproductive aging and identifying menopause predictors.

Purpose of the Study:

To review current research on reproductive hormone changes during the menopausal transition.
To evaluate the potential of hormones like FSH, AMH, inhibin B, and estradiol as predictors of MT duration and FMP.

Main Methods:

Analysis of existing data on four key reproductive hormones: follicle-stimulating hormone (FSH), anti-Mullerian hormone (AMH), inhibin B, and estradiol.
Characterization of the temporal sequence of hormonal changes throughout the menopausal transition.

Main Results:

Hormonal patterns show an increase in FSH and decreases in AMH, inhibin B, and estradiol during MT.
AMH is the earliest indicator of change, followed by FSH and inhibin B, with estradiol declining in later stages.
No validated hormone cutpoints currently exist to predict the length of MT or the timing of FMP.

Conclusions:

Hormonal profiles provide insights into the aging reproductive system but lack predictive power for menopause timing.
Current diagnosis of MT and FMP relies solely on clinical signs and symptoms.
Further research is needed to explore the predictive capabilities of AMH and other hormones for menopause onset.