Seasonal hair loss in autumn: causes and duration

Is hair loss in autumn normal?

Around October and November, many people notice more hair on their pillow or in the shower drain. It happens to everyone. On average, an adult loses 50 to 100 hairs per day, but during autumn the number can rise to 150-200. It is a physiological response called seasonal telogen effluvium.

Seasonal autumn hair loss has a clear explanation. During summer, the sun prolongs the hair growth phase (anagen). With the arrival of cooler temperatures and fewer hours of light, the body signals follicles to enter the resting phase (telogen). Two or three months later—that is, in autumn—these hairs fall out all at once. It is a reset, not damage.

How long does it last? Typically 6-8 weeks. If it exceeds three months or you notice visible patches, it is best to consult a dermatologist. Until then, no potion or shampoo will stop the shedding: it is completing its natural cycle.

Many people worry about thinning that is actually just normal turnover. Once the mechanism is explained, the tension subsides. Seasonal autumn hair loss worries more for its visibility than for the real risk.

Some practical details: if the scalp itches or reddens, there may be something else (an iron deficiency, a thyroid disorder). But for most, it is just the physiological change of season.

Why do you lose more hair in autumn? Scientific causes

In autumn, many notice an increase in hair loss. It is not a coincidence. The phenomenon has precise evolutionary and biological roots; it is not a defect of your body.

The telogen phase and seasonal timing

Each hair follicle follows a cycle: anagen (growth, 3-5 years), catagen (transition, 2-3 weeks), telogen (rest, 2-4 months). At the end of telogen, the hair falls out. The key point is synchronization: during summer, a greater number of follicles remain in anagen, driven by increased sun exposure and daylight hours. With the arrival of autumn and the decrease in solar radiation, many follicles collectively transition to the telogen phase. Between September and November, a collective release of hairs that had been pending occurs.

It happens often: in October more hairs are lost each day than during the rest of the year. The cause is this synchronized influx into the resting phase, a sort of seasonal "spring effect."

The environmental signal: light and melatonin

The main driver is the reduction in sunlight. Days get shorter, UV exposure decreases. The body responds by increasing melatonin production and altering prolactin levels. Both hormones influence the follicle cycle, accelerating the transition into telogen. A 2009 study published in the British Journal of Dermatology measured this peak: the percentage of hairs in telogen goes from 10-15% in summer to 18-25% in autumn over about 4 weeks.

It is not a pathological loss. It is an adaptive response inherited from our ancestors. In summer, a thicker coat was needed to protect the scalp from the sun. In autumn, the body reduces metabolic effort and sheds the excess mass.

Vitamin D deficiency and autumn shedding

With autumn, vitamin D levels also drop. Cutaneous synthesis decreases by 60-70% between October and February, especially above the 40th parallel. Vitamin D directly regulates the hair follicle cycle: specific receptors are present in the dermal papilla. People with telogen effluvium often show lower serum vitamin D levels than those without the condition. Deficiency prolongs the telogen phase and weakens the hair shaft. However, blind supplementation is not necessary: a blood test costs about 25-35 € and provides a clear answer.

Here are signs indicating a possible involvement of vitamin D in autumn shedding:

• The shedding is diffuse over the entire scalp, not just the crown.
• Hair appears drier and more brittle, breaking easily during brushing.
• It is associated with general fatigue, muscle aches, or low mood.
• Regrowth is slow: new hairs take 8-10 weeks instead of the usual 4-6.
• Shedding begins as early as late September, anticipating the October-November peak.

Oxidative stress and thyroid hormones in autumn

The change of season does not only affect melatonin and vitamin D. It also impacts the thyroid axis. With cold and less light, the body tends to slow down basal metabolism. The thyroid responds by reducing T3 and T4 production, and this has a direct effect on follicles. A TSH that rises precisely in the autumn months can go hand in hand with increased shedding. Once thyroid function is brought back within range under medical supervision, shedding also tends to return to normal.

Summer oxidative stress—UV rays, pool chlorine, sea salt—accumulates damage that manifests in autumn. Free radicals damage the follicle sheath and accelerate apoptosis. Oxidative stress markers on the scalp tend to be higher at the end of summer than in the preceding months.

Comparison: seasonal vs. chronic shedding

Characteristic Seasonal effluvium Androgenetic alopecia Duration 6-8 weeks, then spontaneous regression Progresses over years Distribution Uniform over the entire scalp Crown and temples (men), hairline recession (women) Daily shedding 100-150 hairs/day at peak 60-90 hairs/day, but constant Response to supplements Good within 4-6 weeks Requires minoxidil or finasteride Useful tests Vitamin D, TSH, ferritin DHT, sex hormones, follicular ultrasound

Distinguishing the two forms is crucial. Autumn shedding resolves on its own within 2 months. Chronic shedding does not. If by December the loss does not decrease or hair does not regrow, a dermatologist is needed. A specialist visit in Italy costs between 80 and 150 €. In Turkey between 500 and 1,200 TL (15-40 €). In Albania, dermatological visits can be found for 1,500-2,500 lek (12-22 €). The cost is worth the correct diagnosis.

More pronounced autumn shedding often hides low ferritin. In these cases no medication or procedure is needed: a blood test costing around €25, iron supplementation agreed with your doctor, and a little patience.

How long does autumn shedding last? And when does it end?

The beauty of this type of shedding is that it has a precise expiration date. It is not a problem that drags on indefinitely.

In most cases, seasonal hair loss in autumn lasts 6 to 8 weeks. It starts to become noticeable around mid-October, peaks in November, and then begins to slow down on its own. December and January usually see a return to normal. If in February you are still collecting clumps from your pillow, it is probably no longer autumn's fault.

Why this time frame? Hairs in the telogen phase (resting phase) wait about three months from the "shed" signal until actual shedding. Summer stress or changes in light start the countdown in September. October and November are the months of the show. Then, in December, the follicles awaken and start producing a new hair.

What influences the duration?

Not all cases are identical. Some factors can lengthen the window:

• Physical or emotional stress: An intense period at work or a bereavement can add to seasonal telogen effluvium, prolonging shedding by a few weeks.
• Nutritional deficiencies: A diet poor in iron, zinc, or proteins slows down turnover. The cycle lengthens because the follicle lacks the building blocks to construct the new hair.
• Transient illnesses: A high fever in October can delay recovery. The body prioritizes other things.

If shedding exceeds two and a half months without signs of improvement, it is worth getting a check-up. Not to cause alarm, but to rule out other causes. A blood test or trichoscopy by a dermatologist clarifies the picture in minutes.

The sign that it is ending? You start to see short, rebellious new hairs sprouting among the long ones. These are baby hairs, the sign that the follicle has resumed its work. Shedding gradually slows down, it does not stop overnight.

Remedies for seasonal shedding: supplements, nutrition, and care

When autumn arrives and the bathroom floor becomes covered in hair, the temptation is to rush out and buy the most advertised supplement. Hold on: not all work the same way, and often the problem is not a generic deficiency but something more specific.

Supplements: what really helps

Iron is the first suspect, especially in women. Even a mild deficiency - ferritin below 40 ng/ml - can accelerate shedding. In autumn, levels tend to drop because summer, with sweat and lighter eating, has already put them to the test. Go ahead with an iron bisglycinate supplement (better tolerated) if tests confirm it. Without tests, better not to shoot in the dark: too much iron does not help.

Vitamin D deserves a separate discussion. In summer, we produce it from the sun. In autumn, stores plummet. Those with vitamin D levels below 20 ng/ml tend to lose more hair than those with normal values. A supplement of 1000-2000 IU per day, from October to March, makes sense for many. Few know that vitamin D helps follicles enter the anagen phase, the growth phase.

Zinc and selenium appear in every formula, but the truth is they are only needed if there is a documented deficiency. Excess zinc, moreover, can be toxic to the follicle. Better to focus on biotin (500-1000 mcg per day) and organic silicon: they help keratin structure better, and regrowing hair is stronger.

Nutrition: what to put on your plate

No miracle diet, but some precautions matter. Proteins are the building block of hair: an adult needs about 0.8-1 gram per kilogram of body weight, and in autumn we often fall below this threshold. Eggs, oily fish, legumes, and lean meat are good. I add a handful of nuts per day: omega-3s help keep the scalp hydrated and less inflamed.

Spinach and dark leafy greens provide non-heme iron and folates. To improve absorption, just a little lemon juice on the plate. Red peppers and citrus fruits are full of vitamin C, which is needed not only for iron but also for collagen production - essential for follicle structure.

Daily care: actions that make a difference

What role do vitamins play in autumn shedding?

Vitamins do not "stop" seasonal shedding, but a deficiency can make it longer or more noticeable. The hair cycle needs a constant supply of micronutrients. In autumn, the body shifts resources toward the immune system, and the hair bulb falls behind. If iron, zinc, or vitamin D are lacking, seasonal telogen effluvium lengthens.

Which deficiencies matter most

• Iron. Ferritin below 40 ng/ml slows regrowth. About 40% of women of childbearing age have low stores, and in autumn the problem adds to natural loss.
• Vitamin D. Vitamin D receptors are present in follicles. Levels below 20 ng/ml are associated with more pronounced shedding. In winter, levels plummet - better to check them in September.
• Zinc and selenium. Needed for keratin synthesis. A mild deficiency gives no symptoms, but hair grows thinner.
• Biotin, B12, folic acid. Useful only if there is a real deficiency. No need to supplement them randomly.

In practice: you don't need a DIY multivitamin. It is common to spend money on supplements that are not needed, while the real problem is vitamin D that is too low. A blood test costs less and gives real answers. If everything is normal, the seasonal autumn hair loss resolves on its own in 6-8 weeks. Supplementation only makes sense for documented deficiency.

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