Hair loss is a common concern for women, and it can become more pronounced during menopause. As many as two-thirds of postmenopausal women experience hair thinning or bald spots. This article explores the connection between menopause and hair thinning, delving into the hormonal and metabolic changes that contribute to this phenomenon, and the available treatments.
Menopause is defined as the permanent cessation of menstruation for 12 months due to estrogen deficiency. The menopausal transition involves significant hormonal changes, particularly a decrease in estrogen levels. These hormonal shifts can lead to various symptoms, including vasomotor disturbances like hot flashes and night sweats, experienced by over 80% of women. The decline in estrogen levels during menopause can be related to alterations in hair follicle (HF) dynamics, including thinning, loss of volume, and changes in texture. A clear association between menopause and both cicatricial and non-cicatricial alopecia in women has been reported.
The hair follicle (HF) is a complex mini-organ composed of diverse cell populations. The HF’s growth cycle is regulated by the endocrine system, where androgens play a crucial role as primary regulators. In post-menopausal women with androgenetic alopecia (AGA), lower levels of estrogen and higher levels of androgens, such as testosterone and dihydrotestosterone (DHT), have been observed compared to those without hair loss. Estradiol can profoundly impact both the growth and life cycle of the HF by binding to estrogen receptors (ERs). This interaction influences aromatase activity, the enzyme responsible for converting androgens into estrogens. Estradiol extends the anagen phase of the hair cycle, promoting hair growth by augmenting the synthesis of crucial growth factors that stimulate the proliferation of follicular keratinocytes.
In contrast to the swift decline in estrogen and progesterone, androgen secretion diminishes gradually with menopause and aging. The proportional rise in androgens during menopause results in clinical hyperandrogenism, characterized by sebaceous gland hypertrophy and AGA following a female pattern due to a localized reduction in hair renewal and growth.
Menopause mirrors the aging process, affecting metabolism and blood flow to the HFs, influencing the availability of vital nutrients. The transition into menopause and the accompanying shifts in hormonal balance have been linked to adverse alterations in various indicators of metabolic health, including elevated blood glucose, accumulation of abdominal adiposity, and unfavorable changes in serum lipid profiles. Hormones, mainly estrogens, have several protective effects on metabolic health: they are involved in glucose transport into cells, increase the basal metabolic rate, reduce insulin resistance, and control the production of both high-density lipoprotein (HDL) and low-density lipoprotein (LDL).
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The active growth of the HF requires and disperses large amounts of energy. Human HF stem cells primarily utilize aerobic glycolysis as their metabolic pathway. Glycogen (GL) performs many complex roles in the HF, diminishing during catagen and being completely absent during telogen. The enzyme glycogen phosphorylase (PYGL) is involved in GL storage, and its inhibition in vitro has been associated with an increase in HF elongation and anagen prolongation. The outer root sheath (ORS) cells are a significant location for GL synthesis and serve as a functional GL storage site, also exhibiting gluconeogenesis capability, which the HF uses for the maintenance of the anagen phase.
One of the most detrimental consequences of hormonal changes is the increased conversion of testosterone to DHT, which begins in the region of the bulb, where dermal papilla (DP) cells are located. Estrogen has vasodilatory effects, meaning it helps dilate blood vessels and improve blood flow. Reduced circulation in conditions that cause hair loss can restrict the flow of nutrients and oxygen, among other detrimental effects.
Treatment for hair loss depends on the cause and may include:
Lifestyle Modifications: Reducing stress through techniques like talking with a mental health professional and avoiding damaging hair products (like chemical treatments) can be beneficial. Changing your hairstyling routine to avoid damaging your hair follicles is also important.
Vitamins and Supplements: Taking vitamins or supplements for a vitamin deficiency, such as iron, zinc, biotin, or vitamin D, can address underlying nutritional issues contributing to hair loss.
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Medications:
Light Therapy: Forms of light therapy like the HairMax Lasercomb® and Theradome LH80 PRO® helmet, both FDA-approved, utilize low-light lasers to treat FPHL.
Other Treatments:
A combination of therapies may be the most effective approach. One successful regimen includes:
Some women may experience hair loss phenomena equivalent to female pattern hair loss (FPHL) with slight thinning and miniaturization, even without hormonal changes or clinical manifestations of menopause. This suggests that there may be a "menopause of the HF" independent of clinical menopause, possibly due to changes in the metabolism of the HF because of individual factors such as changes in estrogen receptor responses, genetics, and the microbiota.
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