Hair Loss in Women: Causes, Treatment Options, and What Actually Works

Hair loss is most often discussed in the context of men — male pattern baldness, receding hairlines, the DHT conversation. But female hair loss is at least as common, significantly more emotionally impactful due to social context, and more complex in its causes and treatment.

Here's a complete guide to female hair loss: what causes it, what types there are, and what treatments have actual evidence.

The Main Types of Female Hair Loss

Female Pattern Hair Loss (FPHL) / Androgenetic Alopecia

The female equivalent of male pattern baldness. Rather than receding hairlines, women with FPHL experience diffuse thinning, primarily at the crown and part line — the Ludwig pattern. Hairline is usually preserved.

FPHL is the most common form of female hair loss. It has a genetic component and is influenced by androgens (testosterone, DHT), though the relationship is less direct than in men. Many women with FPHL have normal androgen levels — the sensitivity of hair follicles to androgens varies.

Onset is typically around menopause when estrogen (which partially counteracts androgenic hair follicle effects) declines, but FPHL can begin in the 20s and 30s.

Telogen Effluvium

A temporary diffuse hair shedding triggered by systemic stress. The body shunts hair follicles into the telogen (resting/shedding) phase. Triggers include:

• Major illness, surgery, or hospitalization
• Significant weight loss or caloric restriction (including GLP-1 weight loss — see below)
• Hormonal shifts: postpartum, stopping oral contraceptives, thyroid changes
• Iron deficiency anemia
• Extreme emotional stress
• Nutritional deficiencies (protein, zinc, vitamin D, B12)

Telogen effluvium typically presents as noticeable shedding starting 2-3 months after the triggering event (the delay reflects the follicle cycle). The good news: it's almost always reversible once the trigger is addressed.

Alopecia Areata

Autoimmune hair loss — the immune system attacks hair follicles. Presents as distinct circular bald patches rather than diffuse thinning. Can affect any hair-bearing area. Requires dermatology evaluation and different treatment than FPHL.

Traction Alopecia

Hair loss at the hairline and temples from repeated tension — tight hairstyles, extensions, cornrows. Common in women who regularly wear their hair pulled tight. Reversible if caught early; permanent if sustained long-term.

Hair Loss on GLP-1 Medications

This deserves specific attention because of how commonly Marrow patients start GLP-1 treatment.

Hair shedding during GLP-1 weight loss is real and commonly reported. It's almost always telogen effluvium, not androgenetic alopecia. The triggers:

1. Rapid weight loss: Any time body weight drops quickly — whether from GLP-1, bariatric surgery, or restrictive dieting — the physiological stress can trigger telogen effluvium
2. Reduced protein intake: GLP-1 suppresses appetite including protein intake. Inadequate protein directly causes hair follicle miniaturization
3. Micronutrient changes: Caloric restriction may reduce zinc, iron, and B vitamins

The fix: - Maintain protein at 1-1.2g per pound of bodyweight — this is the most impactful intervention - Supplement zinc, vitamin D, and B-complex proactively - Ensure iron levels are adequate (check ferritin — should be above 40 ng/mL for optimal hair health) - Accept that shedding typically peaks at months 2-4 and then resolves as weight loss rate slows

For most women on GLP-1, hair loss is temporary. If shedding is severe or not resolving by month 5-6, a full hormonal and nutritional panel is warranted.

Treatment Options: What Has Evidence

Minoxidil (Topical)

The most established topical treatment for female hair loss. Originally a blood pressure medication, it was found to stimulate hair growth as a side effect. Available OTC.

Evidence: Strong for FPHL and telogen effluvium. Minoxidil extends the anagen (growth) phase of hair follicles and may increase blood supply to follicles. Most studies show 20-25% increase in hair count with consistent use.

Application: 2% foam or solution twice daily, or 5% once daily (some dermatologists prefer once-daily 5% for better adherence). Must be used consistently — effects reverse within months of stopping.

Oral minoxidil at very low doses (0.625-1.25mg/day) is increasingly used by dermatologists for women who don't respond to topical, with significant results in some patients.

Finasteride (Prescription)

A DHT blocker — the same medication used for male pattern baldness. More complicated in women: - Not appropriate for women of childbearing potential due to teratogenicity risk - May be appropriate for postmenopausal women with FPHL not responding to minoxidil - Requires physician evaluation and discussion of risk/benefit

Evidence in women is less robust than in men, but some trials show benefit for postmenopausal FPHL.

Spironolactone (Prescription)

An androgen blocker originally used for blood pressure. Increasingly used for FPHL in women, especially those with elevated androgens or PCOS. Reduces androgenic effects on hair follicles.

Evidence: Moderate — several observational studies and case series show benefit for FPHL in women, particularly with androgen excess. Better studied for acne but widely used off-label for hair loss.

Considerations: Requires prescription and regular monitoring (potassium levels, blood pressure). Not appropriate in pregnancy.

PRP (Platelet-Rich Plasma)

Injections of growth factors derived from your own blood into the scalp. Evidence is improving but still mixed — some randomized trials show benefit, others show modest results. Generally considered an adjunctive treatment rather than monotherapy.

Nutritional Interventions

The most underused and underappreciated category. Hair requires: - Iron/ferritin: Ferritin below 40 ng/mL impairs hair growth even in the absence of frank anemia. Iron supplementation can produce significant improvements in women with low-normal ferritin - Zinc: Zinc deficiency impairs the hair growth cycle. Supplement 25-50mg/day if deficient - Biotin: Overmarketed, but deficiency (uncommon) does cause hair loss. More important for women on restrictive diets - Vitamin D: Low vitamin D correlates with hair loss; supplementation is low-risk and widely recommended - Protein: Non-negotiable. Under 100g/day protein in women with active hair loss is a problem

Topical Ketoconazole

Anti-dandruff shampoo (Nizoral) used 2-3x weekly has modest evidence for FPHL. The mechanism may involve anti-inflammatory or weak anti-androgenic effects at the follicle level. Low cost, low risk, worth adding to a regimen.

Getting a Diagnosis Right

Before treating, understand what type of hair loss you have. Self-diagnosis is often wrong.

Signs worth dermatology evaluation: - Patchy hair loss (not diffuse) — could be alopecia areata - Scalp symptoms: itch, pain, scaling — may indicate inflammatory scalp condition - Rapid onset over weeks — could be alopecia areata or severe telogen effluvium - Hairline recession pattern (more male-pattern) — might indicate higher androgen activity

Lab work that should accompany female hair loss evaluation: - Ferritin (not just hemoglobin/hematocrit) - Thyroid function (TSH, free T4) - Total and free testosterone, DHEAS - Estradiol (postmenopausal women) - 25-OH vitamin D - Zinc

[Start a consultation at Marrow](/start) to discuss hormonal factors in hair loss as part of a complete health evaluation.