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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.

Disorders of the Female Reproductive System

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...

Menses Phase

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...

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

An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause

An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause

Published on: August 13, 2019

[Phytoestrogens and menopausal symptoms].

Steinar Madsen¹

¹Statens legemiddelverk, Sven Oftedalsvei 8, 0950 Oslo, Norway. steinar.madsen@legemiddelverket.no

Tidsskrift for Den Norske Laegeforening : Tidsskrift for Praktisk Medicin, Ny Raekke

|November 10, 2009

Summary

Phytoestrogens (plant oestrogens) are popular for menopausal symptoms, but their effectiveness remains difficult to assess. Similar precautions to conventional oestrogen therapy are advised if phytoestrogen treatment is initiated.

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Last Updated: Jun 18, 2026

An In Vivo Estrogen Deficiency Mouse Model for Screening Exogenous Estrogen Treatments of Cardiovascular Dysfunction After Menopause

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Published on: August 13, 2019

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Area of Science:

Endocrinology
Pharmacology

Context:

Phytoestrogens (plant oestrogens) are increasingly used as alternatives to conventional oestrogen products for managing menopausal symptoms.
Various phytoestrogen preparations are commercially available, marketed for their efficacy in alleviating menopausal complaints.

Purpose:

To evaluate the current clinical evidence regarding the effectiveness of phytoestrogen treatment for menopausal symptoms.
To provide guidance on the appropriate use and precautions associated with phytoestrogen therapy.

Summary:

Despite their popularity, a comprehensive assessment of phytoestrogen effectiveness for menopausal symptom relief is challenging due to mixed clinical trial results.
Clinical data suggests that while phytoestrogens are considered, their therapeutic benefits require careful consideration.
If initiating phytoestrogen treatment, it is crucial to adopt similar safety precautions as those recommended for conventional oestrogen therapy.

Impact:

Highlights the need for further rigorous clinical trials to establish definitive efficacy and safety profiles of phytoestrogens.
Informs healthcare providers and patients about the current limitations in assessing phytoestrogen effectiveness.
Emphasizes the importance of a cautious approach, mirroring conventional oestrogen guidelines, when considering phytoestrogen interventions for menopausal symptom management.