The Short Answer
Eyelashes fall out as part of the natural growth cycle. Losing 1 to 5 lashes per day is completely normal. Excessive eyelash loss can be caused by thyroid disorders, alopecia areata, blepharitis, nutritional deficiencies, harsh cosmetic habits, or certain medications. If you are losing noticeably more lashes than usual, consult an eye care professional.
Why Trust The Lash List
We research eyelash health using peer-reviewed clinical sources, ophthalmology guidelines, and dermatology literature. Every medical claim in this guide is cited to a specific source. Our editorial methodology prioritizes accuracy and safety, especially for health-related content. We are not doctors, and this guide is not medical advice. Always consult a qualified professional for a diagnosis.
The Natural Eyelash Shedding Cycle
Every eyelash goes through a complete growth cycle lasting roughly 4 to 11 months. Your upper lid holds 90 to 160 lashes, while the lower lid carries around 75 to 80. At any given time, each lash is in one of three phases: anagen (active growth), catagen (transition), and telogen (resting and shedding).
The Eyelash Growth Cycle
Understanding the cycle explains why lost lashes take time to regrow.
Because your lashes cycle independently, a handful fall out each day while new ones are already growing behind them. Shedding 1 to 5 lashes daily is entirely normal. Most people never notice because replacements are already underway.
This natural turnover is why a lost lash is rarely cause for concern. The question is whether you are losing more than that baseline and whether the rate has changed. For a deeper look at the growth timeline, see our guide on how long eyelashes take to grow back.
Is It Normal to Lose 10 Lashes a Day?
Losing 10 or more eyelashes a day is above the normal range and could indicate an underlying issue. The typical daily loss is 1 to 5 lashes. If you are consistently finding more than that on your pillow or makeup remover pad, it is worth paying attention.
One helpful approach: track your lash loss for a full week. If the average stays at 1 to 5, you are within normal range even if one day spiked higher. Consistently at 8 to 10 or above? That pattern is worth investigating.
Seasonal variation is real. Hair loss, including eyelash loss, tends to increase in fall (September through November) as part of a natural cycle driven by daylight changes. A temporary uptick during autumn does not necessarily signal a medical problem.
When should you worry? If the shedding is persistent (more than 2 to 3 weeks), one-sided (affecting only one eye), or accompanied by itching, redness, crusting at the lash line, or hair loss elsewhere on your body. Any of these warrants a visit to your eye care provider or dermatologist.
Medical Conditions That Cause Eyelash Loss
When eyelash loss goes beyond normal shedding, a medical condition is often behind it. The clinical term for lash loss is madarosis, and it has a well-documented list of causes. Here are the most common, according to the American Academy of Ophthalmology.
Thyroid Disorders
Both hypothyroidism and hyperthyroidism can cause eyelash and eyebrow thinning. The classic sign is loss of the outer third of the eyebrow alongside thinning lashes. Thyroid hormones regulate the hair growth cycle, and when levels are off, follicles can shift prematurely into the resting phase. The Mayo Clinic notes that hair thinning is one of the most common symptoms of thyroid dysfunction. Once thyroid levels are stabilized through medication, hair and lash regrowth typically follows within a few months.
Alopecia Areata
Alopecia areata is an autoimmune condition in which the immune system attacks hair follicles, causing patchy hair loss. While most people associate it with scalp hair, it can affect eyelashes and eyebrows specifically. A study published in the Journal of Clinical and Aesthetic Dermatology (PMC2884829) found that eyelash involvement occurs in a meaningful subset of alopecia areata patients. The American Academy of Dermatology reports that roughly 6.8 million people in the U.S. have this condition. Diagnosis typically involves a dermatologist examining the pattern of loss.
Blepharitis
Blepharitis is chronic inflammation of the eyelid, and it is one of the most common eye conditions that leads to lash loss. Symptoms include crusting at the base of the lashes, red and swollen lid margins, itching, and a gritty or dry eye sensation. According to the National Eye Institute, blepharitis can cause lashes to fall out or grow in abnormal directions. The good news: it is highly treatable with proper lid hygiene, warm compresses, and sometimes prescription drops.
Trichotillomania
Trichotillomania is a hair-pulling disorder classified as an obsessive-compulsive related condition. While it most often involves scalp hair, eyelash pulling is a well-documented variant. Trichotillomania affects roughly 1 to 2% of the population. Treatment typically involves cognitive behavioral therapy with a mental health professional experienced in body-focused repetitive behaviors.
Demodex Mites
Demodex folliculorum are microscopic mites that live in hair follicles, more common than most people realize. When their population grows too large, they cause irritation at the lash base, lid inflammation, and eyelash loss. Your eye care professional can diagnose a Demodex infestation by examining a lash sample under a microscope. Treatment is straightforward: tea tree oil-based lid scrubs or prescription options.
When to See a Doctor About Eyelash Loss
- You are losing significantly more than 5 lashes per day for more than 2 to 3 weeks
- The loss is one-sided or concentrated in a specific area
- You notice crusting, redness, swelling, or itching at the lash line
- You are also losing eyebrow hair, scalp hair, or body hair
- The loss started after beginning a new medication
- You have a known thyroid condition and your lashes are thinning
Which Deficiency Causes Eyelash Fall?
Nutritional deficiencies can weaken hair follicles throughout your body, including your lash follicles. If your eyelash loss is accompanied by dry skin, fatigue, brittle nails, or general hair thinning, a deficiency could be a contributing factor. According to the Cleveland Clinic, nutritional deficiencies are among the most common triggers of telogen effluvium, a type of diffuse hair shedding that can include eyelash loss. Here are the most common deficiencies linked to lash and hair loss:
- Iron deficiency is the most common nutritional cause of hair loss. Iron carries oxygen to hair follicles via red blood cells. When levels drop, follicles are starved of oxygen and lashes can thin or shed prematurely. A serum ferritin blood test can confirm this.
- Biotin (vitamin B7) deficiency disrupts keratin production, the protein that makes up 90% of each lash strand. True biotin deficiency is rare in people eating a balanced diet, but can occur with certain medications or digestive conditions.
- Zinc deficiency impairs cell division and protein synthesis in the hair follicle. Low zinc is associated with telogen effluvium, where too many hairs shift into the resting phase at once.
- Vitamin D deficiency has been linked to alopecia areata and general hair thinning. Vitamin D receptors play a role in the hair growth cycle, and low levels may push follicles into the resting phase prematurely.
- Omega-3 fatty acid deficiency can contribute to dry, brittle lashes that break more easily. Omega-3s support the oil glands around the eyelid that keep lashes conditioned.
If you suspect a deficiency, a blood panel from your doctor is the right first step. Self-supplementing without testing can lead to taking nutrients you do not actually need, and some (like iron and zinc) can cause harm in excess.
Can Mascara or Fake Lashes Cause Eyelash Loss?
Yes, but the risk depends entirely on the product type and how you use it. Cosmetic habits are one of the most common, and most preventable, causes of eyelash loss.
Waterproof mascara is the biggest culprit. These formulas bond tightly to the lash shaft, and removing them requires aggressive rubbing or harsh solvents that pull lashes out of the follicle. Switch to a gentle oil-based remover and soak your lashes rather than scrubbing. Save waterproof formulas for special occasions.
Eyelash extensions cause traction alopecia when applied repeatedly over months or years. The weight and adhesive put constant stress on the natural lash follicle, eventually weakening it. Continuous wear without breaks is a common reason women seek eye care help for thinning lashes. Give your natural lashes at least a 4-to-6-week break between sets.
Strip lashes are generally safe if removed gently. Use an oil-based adhesive remover and peel slowly from the outer corner rather than pulling quickly.
Magnetic lashes carry the least risk because they do not use adhesive that bonds to natural lashes. They sit on the lid via small magnets, so removal does not create traction stress.
For tips on protecting lash health while using eye cosmetics, our lash serum side effects guide covers what to watch for and how to minimize irritation around the eye area.
What Medications Cause Eyelash Changes?
Several categories of medication can affect eyelash growth, either by causing loss or, in some cases, by triggering unwanted changes in texture and direction.
Chemotherapy is the most well-known cause. Because these drugs target rapidly dividing cells, hair follicles (including lash follicles) are affected. The loss is temporary. Most patients see full lash regrowth within 3 to 6 months after treatment ends.
Retinoids (isotretinoin, tretinoin) can cause eyelash thinning and dry eye by disrupting the oil glands along the lid margin, leading to drier, more brittle lashes.
Blood thinners (warfarin, heparin) are associated with telogen effluvium, where a disproportionate number of hairs enter the resting phase simultaneously. This can include eyelash hair.
Some antidepressants, particularly SSRIs and lithium, have been linked to hair thinning in clinical reports, though eyelash-specific loss is less commonly documented.
Thyroid medications, when dosage is not properly calibrated, can paradoxically cause hair changes as hormone levels fluctuate during adjustment. This resolves once the correct dose is established.
If you suspect a medication is causing your eyelash loss, do not stop taking it without consulting your prescriber. A dosage adjustment or alternative medication can often resolve the issue.
How to Get Your Eyelashes to Grow Back
The most important step in regrowing lost eyelashes is identifying and addressing the underlying cause. A lash serum cannot overcome an untreated thyroid disorder, and no amount of biotin will fix blepharitis. Once the root issue is handled, most people see their lashes return within 6 weeks to 3 months.
Address the underlying cause first. If a medical condition is driving the loss, treatment of that condition is the path to regrowth. Thyroid medication for thyroid disorders. Lid hygiene for blepharitis. Iron supplementation for confirmed iron deficiency. Cognitive behavioral therapy for trichotillomania. Work with your doctor to get a proper diagnosis before spending money on cosmetic solutions.
Practice gentle eye care habits. Stop rubbing your eyes aggressively. Switch from waterproof to regular mascara. Remove eye makeup with oil-based cleansers rather than scrubbing. Avoid eyelash curlers when your lashes are already thinning. These small changes reduce the mechanical stress that accelerates loss.
Support with nutrition. If blood work shows a deficiency, targeted supplementation helps. Otherwise, a diet rich in protein, iron, omega-3 fatty acids, and vitamins A, C, D, and E supports healthy hair growth across your entire body, lashes included.
Consider a peptide-based lash serum once the underlying cause is managed. When your lash loss is cosmetic or recovery-related, a prostaglandin-free lash serum with clinical-grade peptides can help speed regrowth. Peptides like myristoyl pentapeptide-17 stimulate keratin production, while botanicals like red clover extract support the growth cycle. For how these formulas work, see our guide on whether lash serums really work.
A lash serum is not a replacement for medical treatment. If your eyelash loss is caused by alopecia areata, an active thyroid problem, or a medication side effect, the serum will not solve that. But for people whose underlying issue is resolved and who want to accelerate recovery, a well-formulated peptide serum is a reasonable tool. Our best peptide lash serums guide ranks the top options, and our ingredient checker lets you verify what is in any formula before you buy.
For the timeline of lash regrowth, see how long eyelashes take to grow back. If you have sensitive eyes, our best lash serum for sensitive eyes guide narrows the field. And check how long lash serums take to work to set realistic expectations.
Frequently Asked Questions
Why do I suddenly have no eyelashes?
Sudden eyelash loss can be triggered by alopecia areata, thyroid disorders, severe stress, a new medication, or an allergic reaction to eye cosmetics. If your lash loss appeared quickly, see a dermatologist or ophthalmologist. Sudden onset often points to a treatable cause.
What autoimmune disease makes your eyelashes fall out?
Alopecia areata is the most common autoimmune condition behind eyelash loss. The immune system attacks hair follicles, causing patchy loss on the scalp, eyebrows, and eyelashes. Lupus and Hashimoto's thyroiditis can also contribute. A dermatologist can help with diagnosis.
What vitamin are you lacking if your eyelashes fall out?
Iron deficiency is the most common nutritional cause. Low iron reduces oxygen supply to hair follicles, weakening growth. Biotin (B7), zinc, vitamin D, and omega-3 deficiencies can also contribute. A blood panel from your doctor is the best way to identify the issue.
Do your eyelashes grow back after they fall out?
Yes, in most cases. Eyelashes typically grow back within 6 weeks to 3 months. If the follicle is damaged from burns or scarring, regrowth may be limited. Addressing the underlying cause is the fastest path to recovery. See our ingredient guide for compounds that support regrowth.
Does Hashimoto's cause eyelash loss?
Yes. Hashimoto's thyroiditis commonly causes hair thinning including eyelash and eyebrow loss. The outer third of the eyebrow thinning alongside lash loss is a classic sign. Once thyroid hormone levels are stabilized with medication, lash regrowth typically follows.