What's the secret to a youthful glow? Your brows. Sure, quality skincare and lashes help give you a polished look, but your brows are the unsung heroes of your face. The ultimate face-definers, they frame the eye contour and balance your facial contours.

They might just be more powerful than all your other beauty efforts combined. That's why thinning brows can make you look tired, aged, or simply less vibrant and put together.

Eyebrows getting thin? Stop "brows'ing" and stay a while to learn the "why" behind eyebrow hair loss, and the ideal solution to help you regain fuller-looking brows.

Cause of Thinning Eyebrows

If you've noticed your brows looking a bit more "sparse" than "spectacular" lately, you are not alone. Sorry to break it to you, but there is more than one reason for thinning eyebrows.

From overtweezing, hormone imbalances, and medical conditions to lifestyle and genetics, here are the top reasons why brows thin:

• Grooming trauma: So, you survived the 70s and 90s, but still have the overplucked brows of those ultra-thin, skimpy brow eras. Did you know that every time you tweezed out an offending hair, you were pulling the entire hair shaft out, with the root attached? This not only traumatized the hair follicle, but disrupted your hair growth cycle and triggered inflammation.

• Follicle damage: Continued physical stress can damage the follicle's delicate structure, leading to scarring and follicle shrinkage. In some (but fortunately, not all!) cases, it can cause the follicle to stop producing hair, preventing new hair from growing in that area.
• Growth cycle upset: Pulling hairs out prematurely forces them into the resting phase, disrupting the natural growth cycle and leading to thinner, finer hairs over time.
• Inflammation: Overdoing it with tweezing also causes local inflammation in the skin, which may lead to folliculitis, ingrown hairs, and further damage to the follicle's stem cells, which are responsible for self-renewal.

Can over-plucked eyebrows grow back? They can, so long as the follicle didn't suffer permanent scarring or destruction of hair-producing cells from decades of trauma.

We aren't suggesting you break up with your tweezers, because few people can pull off the unibrow or caterpillar look like Frida Kahlo or Eugene Levy. Just avoid daily tweezing, which can cause hairs to grow at different rates and look uneven.

• Hormone imbalances: As hormones are key players in the hair growth cycle, they can significantly contribute to brow hair loss when out of balance.

• Pregnancy: Does pregnancy and giving birth affect eyebrows? Surging estrogen levels prolong the hair growth cycle, which means your brows may appear fuller, coarser, and grow back much faster than normal. However, once your bundle of joy arrives, estrogen levels plummet, and the follicles enter the shedding phase. 2-4 months after childbirth, the eyebrow hair fall begins.
• Aging and menopause: Are thinning eyebrows related to aging or menopause? Thinning eyebrows with age and surrounding menopause is real. In your 40s and beyond, declining estrogen levels—the hormone that prolongs the hair growth phase—lead to slower-growing, weaker, and thinner hairs across the body. The natural estrogen dip during perimenopause and menopause, the age-related shortening of the hair growth phase, and lengthening of resting and shedding phases cause brow hair to become finer, sparser, and slower to grow. This can cause a noticeable decrease in fullness.
• Androgens (testosterone/DHT): After menopause, the hormone balance shifts even further. The resulting increase in male hormones (androgens) can cause hair follicles to shrink (follicle miniaturization) and prevent new growth, leading to progressively thinner, sparser brows. Conditions like PCOS (polycystic ovary syndrome) can also cause this in younger women.

If, in addition to thinning brows, you're also experiencing fatigue, weight changes, or irregular periods, it could be due to a hormonal imbalance.

Medical conditions

Thyroid disorders (such as hypothyroidism), inflammatory disorders, autoimmune diseases (like alopecia areata), and skin conditions like eczema can all affect the state of your brows.

• Thyroid hormone imbalance: Can thyroid problems cause eyebrow hair loss? Yes, both an underactive (hypothyroidism) and overactive (hyperthyroidism) thyroid can disrupt hair growth cycles and lead to significant brow thinning. Low levels of T₃ and T₄ thyroid hormones disrupt hair growth, causing follicles to prematurely enter the resting phase. Why are my eyebrows thinning on the outer edges? When the "tail," or outer third, of the brow thins, it is often tied to thyroid dysfunction, which causes hair to shed prematurely. The outer third of eyebrow thinning is often referred to as Hertoghe's sign or Queen Anne's sign. Other hormonal shifts may also cause thinning in the other third of the brow. If you're also experiencing fatigue and sensitivity to cold, your thyroid may be underactive; it might be worthwhile to get it checked out.
• Frontal fibrosing alopecia (FFA): What is frontal fibrosing alopecia and how does it impact hair? An inflammatory condition often linked to post-menopausal hormonal changes, FFA specifically causes progressive loss of the eyebrows and the front hairline.
• Alopecia areata: What is alopecia areata and does it affect eyebrows? It is an autoimmune condition where the body mistakenly attacks hair follicles. It frequently causes patchy hair loss, which can target the eyebrows independently or alongside the scalp.
• Skin conditions: Can skin conditions like eczema or psoriasis cause eyebrow thinning? Indeed, the inflammation, scaling, and flaking associated with seborrheic dermatitis, eczema, or psoriasis (also an autoimmune disease) can harm the skin around the brow and impair follicle health.

Additional Factors

Several factors, like stress, genetics, and your diet, can trigger or exacerbate eyebrow loss.

• Stress & anxiety: Can stress and anxiety cause your eyebrows to fall out? Yes. High stress can push hair follicles prematurely into a resting phase (telogen effluvium), leading to increased shedding on both the brows and scalp.
• Insufficient nutrition: What vitamin or nutritional deficiencies cause thin eyebrows? Deficiencies in iron, biotin, zinc, vitamin D, protein, and B-complex vitamins can starve hair follicles of necessary nutrients, triggering hair shedding.
• Genetics: Do genes play a role in brow hair loss? Yes, they play a significant role. Genetics set your baseline eyebrow thickness and growth patterns, as well as predispose you to certain hereditary conditions (like ectodermal dysplasias or specific genetic alopecias) that can cause permanent, sparse, or missing eyebrow hair. Additionally, androgenetic alopecia (common pattern baldness) can occasionally lead to gradual eyebrow hair thinning.

If you are experiencing noticeable thinning, it is important to first rule out underlying medical or nutritional causes.

The Great Brow Comeback

While it may seem like brow-mageddon, there is a way out. Keeping your brows full and groomed can help you get away with less makeup while looking like your younger self. So, how do you get thicker eyebrows? Look for an eyebrow serum for thicker brows featuring ingredients proven to help manage sparseness and reclaim fuller brows.

Stay tuned, as CHARISMO will soon launch a meticulously formulated brow gel for sparse brows featuring science-backed ingredients to help you reclaim thicker, fuller brows.

When should I see a doctor or dermatologist for thinning brows? You should consult a medical professional if your brow thinning occurs suddenly, appears in distinct patchy bald spots, is accompanied by scalp hair loss, or doesn't improve after addressing lifestyle and diet factors.