Women lose their eyebrows for a wide range of reasons, from hormonal shifts and autoimmune conditions to overplucking and medication side effects. The cause determines whether the loss is temporary or permanent, and whether regrowth is possible. Understanding the pattern of your eyebrow loss, when it started, and what else is going on with your body can help narrow down what’s behind it.
Thyroid Problems and the Outer Third
An underactive thyroid (hypothyroidism) is one of the most well-known causes of eyebrow thinning, and it leaves a distinctive calling card. Women with hypothyroidism often notice hair disappearing specifically from the outer third of the eyebrow, the thinnest section that points toward the ears. This pattern is so recognizable that some clinicians use it as an early visual clue for thyroid dysfunction.
Thyroid hormones regulate the hair growth cycle throughout the body. When levels drop too low, hair follicles spend more time in their resting phase and less time actively growing. The outer eyebrow is particularly vulnerable because those follicles are already finer and less robust than the ones closer to the nose. The good news is that eyebrow loss from hypothyroidism is usually reversible once thyroid hormone levels are brought back to normal with treatment.
Menopause and Hormonal Shifts
Eyebrow hair growth is under direct hormonal control, which is why menopause can visibly change how your brows look. As estrogen production declines, the balance between estrogen and androgens (sometimes called “male hormones,” though women produce them too) shifts. This hormonal imbalance can trigger a process similar to pattern hair loss on the scalp, where individual hairs become thinner and finer over time.
All body hair naturally thins with age, but the eyebrows are especially noticeable because they sit front and center on the face. Women who overplucked during their younger years may find the thinning more dramatic, since repeated plucking can weaken follicles long before hormonal changes arrive. If your eyebrow thinning started gradually around perimenopause or menopause and tracks alongside other hormonal symptoms like hot flashes or changes to scalp hair, declining estrogen is a likely contributor.
Alopecia Areata
Alopecia areata is an autoimmune condition where the immune system mistakenly attacks hair follicles. While it’s best known for causing round, coin-sized bald patches on the scalp, it can also target the eyebrows and eyelashes independently. When it does, you might lose hair in patches or across the entire brow.
The severity of eyebrow and eyelash involvement tends to correlate with how much hair is being lost on the scalp. More extensive scalp loss generally means a higher likelihood that the brows will be affected too. Alopecia areata is unpredictable: hair can regrow on its own, fall out again, or settle into a stable pattern. The follicles themselves aren’t destroyed, which means regrowth is possible even after prolonged loss.
Frontal Fibrosing Alopecia
Frontal fibrosing alopecia (FFA) is a condition that causes hair loss along the front and sides of the scalp, and the eyebrows are one of the most commonly affected areas. In many women, eyebrow thinning is actually the first noticeable sign, appearing before the hairline starts to recede.
FFA is believed to be a type of autoimmune condition related to lichen planus, where inflammation damages follicles and replaces them with scar tissue. That scarring is what makes FFA different from many other causes of eyebrow loss: once the follicle is scarred over, regrowth from that follicle isn’t possible. The condition was once considered rare, but growing numbers of women worldwide are being diagnosed. It predominantly affects postmenopausal women, though younger women can develop it too. Diagnosis typically involves a physical exam and sometimes a small skin biopsy to examine the follicles under a microscope and rule out other conditions like traction alopecia or hereditary hair loss.
Skin Conditions That Damage Follicles
Chronic skin conditions affecting the eyebrow area can lead to gradual hair loss through ongoing inflammation. Seborrheic dermatitis, which causes flaky, red, itchy skin, is a common culprit. The eyebrows are one of its favorite spots because the skin there is rich in oil glands.
The hair loss happens through a few interconnected pathways. Excess oil production creates irritation and inflammation around the follicles. A naturally occurring yeast called Malassezia can overgrow in oily areas, compounding the inflammation and damaging follicles further. And the intense itchiness that comes with seborrheic dermatitis leads to scratching, which can physically harm follicles and obstruct normal hair growth. Eczema (atopic dermatitis) works through a similar cycle of inflammation and scratching. Treating the underlying skin condition usually allows the follicles to recover, though chronic untreated inflammation can cause longer-lasting damage.
Overplucking and Trichotillomania
Repeated mechanical trauma to eyebrow follicles, whether from grooming habits or compulsive pulling, can eventually stop them from producing hair. Each time a hair is plucked, the follicle experiences minor inflammation. Over years of regular plucking, that cumulative damage can weaken follicles to the point where they produce increasingly fine hairs or stop growing altogether.
Trichotillomania, a condition involving a recurrent urge to pull out one’s own hair, can cause more severe damage. If inflamed follicles are repeatedly picked at until they become infected or develop sores, or if scabs are repeatedly pulled off, permanent scarring can develop around groups of follicles. Picking and probing at the skin with nails or tools to get at hair roots or ingrown hairs creates direct damage that may also produce scarring. You can check for permanent damage by examining the area with a magnifying glass: a shiny, smooth patch that looks like scar tissue won’t regrow hair. Fortunately, permanent scarring from pulling is relatively uncommon, and many women who stop plucking do see at least partial regrowth over several months.
Medications That Cause Hair Loss
Drug-induced hair loss can affect any part of the body, including the eyebrows. Several categories of commonly prescribed medications list hair thinning as a potential side effect:
- Blood pressure medications: ACE inhibitors and beta-blockers
- Blood thinners: including warfarin and heparin
- Antidepressants: SSRIs like fluoxetine and sertraline, as well as tricyclic antidepressants
- Hormonal medications: birth control pills and hormone replacement therapy
- Acne treatments: isotretinoin and other vitamin A-based drugs
- Cholesterol-lowering drugs
- Anti-inflammatory drugs: including common over-the-counter options like naproxen
- Gout medications
If your eyebrow thinning started within a few weeks to months of beginning a new medication, the timing is worth noting. Hair loss from medications is generally reversible once the drug is stopped or switched, though it can take several months for normal growth to resume.
Nutritional Deficiencies
Your eyebrow follicles need a steady supply of nutrients to maintain their growth cycle. Iron deficiency is one of the most common nutritional causes of hair thinning in women, and the eyebrows aren’t spared. Zinc, biotin, and essential fatty acid deficiencies can also slow hair growth or cause increased shedding. Women on very restrictive diets or those with absorption issues are particularly vulnerable. Unlike many other causes of eyebrow loss, nutritional deficiencies are straightforward to test for and correct.
Treatment Options for Eyebrow Regrowth
Whether your eyebrows can grow back depends entirely on the cause and whether the follicles are still intact. For reversible causes like thyroid disorders, nutritional deficiencies, or medication side effects, addressing the root problem is usually enough to restore growth over time.
For women looking to actively encourage regrowth, two topical treatments have the most evidence behind them. Minoxidil, applied directly to the brow area, has shown measurable improvement in eyebrow density. In one study of 60 women, 80% saw at least a one-grade improvement in eyebrow fullness after four months of using a 2% minoxidil solution.
Bimatoprost, a compound originally developed for glaucoma that was found to promote hair growth as a side effect, has shown even stronger results for eyebrows. In a seven-month trial, roughly 78% to 84% of women using bimatoprost achieved noticeable improvement in eyebrow fullness, compared to 43% using a placebo. A smaller study of 27 women found that five weeks of daily use improved eyebrow density in 70% of participants and increased hair length in 59%. Both treatments require consistent daily application over weeks to months before results become visible, and the improvements typically fade if you stop using them.
For permanent follicle loss from scarring conditions like frontal fibrosing alopecia, topical treatments won’t restore growth in the scarred areas. Eyebrow transplantation, where hair follicles are moved from the scalp to the brow area, is an option for women with stable, non-progressing scarring. Cosmetic solutions like microblading and eyebrow tattooing can also restore the appearance of full brows without relying on follicle regrowth.