9 Clinically Distinct Types of Hair Loss in Perimenopause and What Each One Requires
The handful of months spent assuming thinning temples were just 'stress' — while the real culprit was androgens shifting unopposed — is one of the most common stories women share on this site. There is something uniquely painful about losing hair because it feels visible in a way that hot flashes or brain fog do not. If that resonates, know that the delay between noticing and understanding is almost never a woman's fault — it is a gap in how perimenopause hair loss is talked about, and this article exists to close it.
Learn more about Rose →Androgenic Alopecia (Female Pattern Hair Loss)
This is the most common type of hair loss in perimenopausal women and is driven by a relative increase in androgen activity as estrogen and progesterone decline — even when absolute androgen levels remain in the normal range. It presents as diffuse thinning at the crown and widening of the central part, with the frontal hairline typically preserved, which distinguishes it from male pattern loss. Treatment is specific: topical minoxidil has the strongest evidence base, and anti-androgen medications such as spironolactone are frequently used off-label with meaningful clinical results.
Telogen Effluvium (Stress-Triggered Mass Shedding)
Telogen effluvium occurs when a physiological stressor — illness, surgery, rapid weight loss, emotional shock, or even the hormonal disruption of perimenopause itself — pushes a large proportion of hair follicles into the resting (telogen) phase simultaneously, resulting in diffuse shedding two to four months after the triggering event. Unlike androgenic alopecia, the shedding is typically diffuse across the entire scalp rather than patterned, and clumps of hair appear on pillows, in the shower drain, and on brushes. The good news is that telogen effluvium is self-limiting in most cases once the stressor resolves, though chronic low-grade stress during perimenopause can sustain it indefinitely without intervention.
Thyroid-Related Hair Loss (Hypothyroid or Hashimoto's Pattern)
Both overt and subclinical hypothyroidism — conditions that are significantly more prevalent in perimenopausal women than in the general population — can cause diffuse hair thinning that closely mimics telogen effluvium, including loss of the outer third of the eyebrows in more pronounced cases. Thyroid hormones directly regulate the hair follicle cycle, and when they are insufficient, follicles spend less time in the growth phase. Critically, this type will not respond to minoxidil or dietary changes until thyroid function is adequately treated, which is why a TSH, free T4, and thyroid antibody panel should be among the first investigations ordered.
Iron Deficiency Hair Loss
Iron is essential for the enzyme ribonucleotide reductase, which drives cell proliferation in the hair matrix, and even non-anaemic iron deficiency — ferritin levels below approximately 30–70 ng/mL depending on the reference used — is sufficient to impair hair cycling and produce diffuse shedding. Perimenopausal women are particularly vulnerable because heavy or irregular periods, a hallmark of the transition, can deplete iron stores faster than diet alone can replenish them. Supplementing iron without confirmed deficiency is not recommended and can cause harm, so a serum ferritin test rather than a standard haemoglobin check is the appropriate investigation.
Zinc Deficiency Hair Loss
Zinc plays a direct role in hair follicle structure and the protein synthesis required for keratin production, and deficiency — more common in women following restrictive diets, those with gastrointestinal conditions, or those under prolonged stress — produces a diffuse thinning that can also affect eyebrows and lashes. Unlike iron deficiency, zinc deficiency hair loss is often accompanied by other signs such as delayed wound healing, altered taste or smell, and increased susceptibility to infection. Zinc supplementation corrects the hair loss when deficiency is confirmed, but excess zinc competitively inhibits copper absorption and can cause its own problems, making testing before supplementing important.
Biotin Deficiency Hair Loss
True biotin deficiency is rare in women eating a varied diet, but it does occur in those who consume raw egg whites regularly (avidin blocks biotin absorption), those with certain gastrointestinal conditions, or those on prolonged anticonvulsant therapy — and when it occurs, it produces brittle hair with diffuse thinning alongside nail fragility and a perioral rash. The widespread marketing of biotin supplements for hair loss has created the false impression that biotin deficiency is common; the evidence does not support routine supplementation in the absence of confirmed deficiency. Worth noting: high-dose biotin supplementation can interfere with thyroid function tests and troponin assays, producing dangerously misleading results, which is medically significant.
Alopecia Areata (Autoimmune Patchy Loss)
Alopecia areata is an autoimmune condition in which the immune system attacks hair follicles, producing discrete, smooth, oval or round patches of complete hair loss rather than the diffuse thinning seen in hormonal or nutritional causes. It is more common in women with other autoimmune conditions — including Hashimoto's thyroiditis, which is itself more prevalent in perimenopause — and while stress can be a trigger, hormonal fluctuation may also play a role in timing flares. This type requires a dermatologist's involvement and is treated with corticosteroid injections, topical immunotherapy, or newer JAK inhibitor medications, none of which overlap with treatments for androgenic or nutritional hair loss.
Traction Alopecia (Mechanical Hair Loss)
Traction alopecia results from chronic tension on the hair follicle — from tight ponytails, braids, extensions, or weaves — and presents as thinning or loss along the hairline, temples, and the margins of hairstyle tension points rather than the crown or part-line typical of androgenic alopecia. In early stages it is completely reversible once the source of tension is removed, but prolonged mechanical stress leads to follicle scarring and permanent loss, making early identification clinically important. It is worth noting that the perimenopausal scalp may be more vulnerable to traction damage as estrogen decline reduces scalp skin thickness and follicle resilience.
Scarring Alopecia (Lichen Planopilaris and Related Conditions)
Scarring alopecias — including lichen planopilaris, frontal fibrosing alopecia (FFA), and discoid lupus — destroy the hair follicle permanently by replacing it with fibrotic tissue, and they are diagnosed by the presence of scalp inflammation, redness, scaling, or tenderness at the margins of the hair loss, often with a distinct recession pattern at the frontal and temporal hairline in FFA. Frontal fibrosing alopecia has seen a striking increase in incidence over the past two decades and disproportionately affects postmenopausal women, with some researchers hypothesising a hormonal component, though the evidence remains preliminary. Unlike every other type on this list, scarring alopecia is a dermatological emergency in relative terms — once follicles are destroyed they cannot regenerate, so early diagnosis and anti-inflammatory treatment to halt progression is the only therapeutic window available.
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