Hair Loss and PCOS: Why It Happens and What Can Help

Why does PCOS cause hair to thin?

In PCOS, the ovaries and adrenal glands may produce androgens — testosterone and related hormones — in higher-than-typical amounts. On the scalp, a byproduct called dihydrotestosterone (DHT) binds to follicles in genetically sensitive areas, causing them to gradually miniaturize and produce shorter, thinner hairs with each cycle until the follicle eventually stops producing a visible hair 1Ref 1American College of Obstetricians and Gynecologists (2018).ACOG Practice Bulletin No. 194: Polycystic Ovary Syndrome.PCOS diagnosis criteria, androgen excess mechanism, hormonal treatment options including contraceptives with anti-androgenic activity, and the role of insulin resistance in amplifying androgen production.

This is the same basic mechanism as male pattern baldness, but it is usually expressed more mildly and in a different distribution: women with PCOS-related thinning typically see widening of the part line and reduced density across the crown (called a Ludwig pattern), while the frontal hairline tends to stay intact 2Ref 2Ioannides D, Lazaridou E (2015).Female pattern hair loss.Ludwig pattern of female androgenetic alopecia, DHT-driven follicle miniaturization in women, and the role of hormone-modulating treatments. The degree of thinning is related both to how elevated the androgens are and to genetic sensitivity of the individual's follicles.

What else could be causing or worsening the thinning alongside PCOS?

PCOS rarely acts alone when it comes to hair loss. Several common co-contributors deserve evaluation:

Iron deficiency. Heavy menstrual bleeding — common in PCOS — increases the risk of iron deficiency, and low ferritin is one of the most common and underappreciated reversible causes of hair shedding. Many clinicians check ferritin alongside the hormone panel 3Ref 3Leung AKC, Lam JM, Wong AHC, Hon KL, Li X (2024).Iron Deficiency Anemia: An Updated Review.Iron deficiency as a common and reversible contributor to hair shedding, particularly relevant in women with heavy menstrual bleeding.

Thyroid dysfunction. Thyroid disease is more prevalent in people with PCOS than in the general population. Both hypothyroidism and hyperthyroidism can cause hair changes, and both are treatable once identified 4Ref 4Jonklaas J, Bianco AC, Bauer AJ, et al. (2014).Guidelines for the Treatment of Hypothyroidism: Prepared by the American Thyroid Association Task Force on Thyroid Hormone Replacement.Thyroid dysfunction as a treatable co-contributor to hair loss, supporting the recommendation to check thyroid function in women with PCOS and hair thinning.

Insulin resistance. Insulin resistance — very common in PCOS — amplifies androgen production in the ovaries. Addressing it through lifestyle changes or medication can lower androgen levels and may slow hair loss indirectly 1Ref 1American College of Obstetricians and Gynecologists (2018).ACOG Practice Bulletin No. 194: Polycystic Ovary Syndrome.PCOS diagnosis criteria, androgen excess mechanism, hormonal treatment options including contraceptives with anti-androgenic activity, and the role of insulin resistance in amplifying androgen production.

Telogen effluvium. A stress-related diffuse shed triggered by illness, crash dieting, surgery, or major emotional stress can layer on top of androgenetic thinning and make it look much worse. A clinician doing a thorough workup will try to separate these threads.

What does treatment for PCOS hair loss look like?

Effective management typically involves two tracks running simultaneously.

Track 1 — addressing the hormonal driver. Your gynecologist, endocrinologist, or primary care provider may discuss options that reduce circulating androgens. Combined oral contraceptives with anti-androgenic activity can lower androgen levels for some people. Spironolactone — an aldosterone antagonist with androgen-blocking properties — is frequently used off-label for hormonal hair loss in women and has supporting evidence in hormonal conditions 5Ref 5Kow CS, Ramachandram DS, Hasan SS, Thiruchelvam K (2025).Spironolactone for the Treatment of Moderate to Severe Acne in Adult Women: A Systematic Review and Meta-Analysis of Randomised Controlled Trials.Spironolactone's anti-androgenic mechanism in women, supporting its use as an androgen-blocking agent in hormonal conditions including PCOS-related androgenetic hair loss. These choices depend on your reproductive plans, medical history, and other PCOS symptoms.

Track 2 — the scalp directly. A dermatologist may discuss topical minoxidil, which acts on follicle cycling independent of hormone levels. It is FDA-approved for female pattern hair loss and is commonly used alongside hormonal management.

Neither track works quickly. Hair cycles are slow — most treatments take several months before stabilization or regrowth becomes visible. Treating contributing factors like iron deficiency or thyroid imbalance often produces a meaningful additional benefit.

How do hormonal contraceptives affect PCOS hair loss?

Not all hormonal contraceptives are equivalent for hair loss. The progestin component matters:

• Combined pills containing progestins with high androgenic activity can worsen scalp thinning in susceptible individuals.
• Pills containing progestins with anti-androgenic activity (such as cyproterone acetate or drospirenone) may help reduce scalp thinning by lowering circulating androgens 1Ref 1American College of Obstetricians and Gynecologists (2018).ACOG Practice Bulletin No. 194: Polycystic Ovary Syndrome.PCOS diagnosis criteria, androgen excess mechanism, hormonal treatment options including contraceptives with anti-androgenic activity, and the role of insulin resistance in amplifying androgen production.

If hair loss is a concern for you, tell your prescriber before a contraceptive is chosen — this is a real clinical consideration that should shape the choice of formulation.

When and where to get care

Because PCOS hair loss sits at the intersection of hormonal and dermatologic medicine, the most effective path is usually:

1. Confirm (or establish) a PCOS diagnosis with a primary care provider, gynecologist, or endocrinologist. Hair thinning alone does not confirm PCOS — a formal diagnostic workup is needed 1Ref 1American College of Obstetricians and Gynecologists (2018).ACOG Practice Bulletin No. 194: Polycystic Ovary Syndrome.PCOS diagnosis criteria, androgen excess mechanism, hormonal treatment options including contraceptives with anti-androgenic activity, and the role of insulin resistance in amplifying androgen production. 2. Get a full hormonal and metabolic panel including androgens, thyroid function, and iron stores. 3. Add a dermatologist who specializes in hair loss for the scalp evaluation and treatment side.

If you have not yet been formally diagnosed with PCOS, that workup comes first. The treatment approach for PCOS-related androgenetic thinning is different from the treatment for other causes of hair loss, and combining them without a clear diagnosis risks treating the wrong condition.