Why Winter Hair Loss Happens and All You Need to Know

Key Takeaways

• Seasonal shedding is normal: Seasonal hair shedding is a natural biological process and most often occurs in late summer and early autumn, rather than during winter.
  
• Winter does not cause permanent hair loss: Cold temperatures, low humidity, and indoor heating can worsen scalp dryness and hair fragility, but they do not cause permanent hair loss.
  
• Vitamin D levels may contribute to shedding: Reduced sunlight exposure in winter can lower vitamin D levels, potentially increasing shedding in individuals who are already deficient.
  
• Winter hair care habits can increase breakage: Hot showers, frequent blow-drying, and increased heat styling can damage the hair shaft, making hair appear thinner, but doesn’t directly affect hair growth.
  
• Existing hair loss conditions may appear worse: Winter conditions can make androgenetic alopecia or telogen effluvium more noticeable, but they do not cause these conditions.
  
• Most winter-related hair changes are temporary: With proper scalp care, gentle styling, and a balanced diet, they usually improve.
  

As temperatures drop and indoor heating kicks in, many people notice their hair feels drier, more brittle, and seems thinner than usual. Hair loss in winter is a common concern, but for most, it’s temporary and linked to environmental factors rather than permanent thinning.

Cold air, low humidity, and indoor heating can stress your scalp and hair. This makes hair breakage and shedding more noticeable. Reduced sunlight during the winter can also lower vitamin D levels, which may contribute to hair shedding in susceptible individuals.

While winter hair changes can be worrying, they are usually reversible with simple care routines, gentle styling, and proper nutrition. 

Is Seasonal Hair Loss Permanent?

Although seasonal hair shedding can be worrying, it is not permanent. If hair loss occurs in autumn or winter, it typically stops after a few weeks to months because it is caused by temporary changes in the normal hair growth cycle rather than permanent damage to the hair follicles.

Seasonal factors, particularly changes in daylight exposure, can trigger more hairs than usual to enter the resting (telogen) phase simultaneously, and once the seasonal trigger passes, they naturally return to the growth (anagen) phase, allowing new hair to regrow and overall hair density to gradually recover.

How Long Does Seasonal Hair Loss Last?

Seasonal shedding usually lasts around two months. During this time, hair in the telogen (resting) phase gradually falls out, and follicles transition back into the anagen (growth) phase. Most reports of winter hair shedding peak in October and November, with hair regrowth generally noticeable by December.

Hair Growth Cycle and Seasonal Timing

Hair grows in a repeating cycle consisting of anagen (growth), catagen (transition), and telogen (resting) phases. Seasonal shedding occurs when a slightly higher number of hairs enter the telogen phase simultaneously, leading to increased shedding several months later.

Multiple studies across different populations demonstrate a global pattern of increased hair shedding in late summer and early autumn^2-4. This is generally considered normal biological variation rather than a disease process, and it is not usually linked to permanent hair loss.

Why Hair Seems Thinner in Winter 

Most people do not lose more hair in winter because of the season itself. Research shows hair shedding peaks in late summer and early autumn¹. However, winter conditions, including reduced daylight, colder air, indoor heating, and changes in hair care habits, can make shedding and breakage more noticeable even if the underlying hair loss has not worsened.

Reduced Sunlight and Vitamin D Levels

Lower exposure to sunlight during the winter months can contribute to reduced vitamin D levels. Vitamin D plays a supportive role in normal hair follicle cycling, and deficiency may be associated with increased shedding, particularly in susceptible individuals.

Cold Weather, Indoor Heating & Scalp Dryness

Cold outdoor air combined with dry indoor heating can impair the scalp’s barrier function. This leads to scalp dryness and irritation, with increased hair shaft fragility, which is often mistaken for true hair loss.

Hair Habits That Increase Damage During Winter

During the colder months, certain everyday habits can unintentionally make hair more fragile and prone to breakage. While these practices may feel comforting or convenient in winter, they can strip natural oils, stress the hair shaft, or weaken hair structure, making shedding and dryness more noticeable. Common winter habits that can increase hair damage include

• Hot showers: While they feel comforting in cold weather, hot water strips the scalp of its natural oils, leading to dryness and brittle hair.
• Frequent blow-drying: Constant heat can weaken the hair shaft and increase the risk of split ends and breakage, especially when used with high heat.
• Increased heat styling: Using straighteners, curling irons, or other heated tools more often can damage hair proteins, making hair fragile and more prone to breakage.
• Tight hairstyles: Repetitive pulling hair back tightly can increase friction and stress on the hair shaft, causing breakage over time; also called traction alopecia.
• Reduced conditioning: Skipping conditioning treatments or masks during winter can leave hair less protected against the drying effects of cold air and indoor heating.

How to Reduce Hair Shedding in Winter

Winter can stress hair due to cold, dry air and changes in daily routines, such as hotter showers, increased use of heat styling tools, wearing hats, or dietary shifts. Adopting proper scalp care, gentle washing and styling habits, and maintaining a nutrient-rich diet can help minimise hair shedding and keep hair healthier during the colder months.

Scalp and Hair Care in Cold Weather

Use gentle, moisturising shampoos and avoid over-washing. Weekly conditioning masks or oils can help maintain scalp comfort and hair hydration.

Washing, Drying & Heat Styling Safely

Opt for lukewarm water when washing. Limit heat styling where possible and use heat protectant products. Evidence suggests that controlled blow-drying at a safe distance may cause less damage than prolonged air-drying close to the hair.⁶

Diet and Supplements 

A balanced diet rich in protein, iron, zinc, essential fatty acids, and vitamins supports hair health. Supplements such as vitamin D or omega-3 should only be considered when a deficiency or dietary insufficiency is identified.⁷

Winter Hair Shedding vs Hair Loss Conditions.

Understanding the difference between normal seasonal shedding and actual hair loss conditions is key. While winter-related shedding is common, severe or persistent hair loss may indicate a medical issue. This section explains how to tell the difference and when to seek help.

Seasonal Shedding vs Telogen Effluvium

Seasonal shedding is mild, short-lived, and self-resolving. Telogen effluvium, by contrast, is triggered by physiological or emotional stressors and causes more diffuse shedding lasting several months.

Can Winter Make Patterned Hair Loss Look Worse?

In androgenetic alopecia (patterned hair loss), winter dryness and reduced hair volume can make hair appear thinner, even though winter itself does not cause pattern hair loss; it can accentuate the appearance of thinning.

When Winter Hair Loss Is Not Normal

Winter hair loss is not normal if shedding is sudden, significantly more than the usual daily loss of 50–100 hairs, or lasts longer than 3–6 months. It is also concerning if accompanied by scalp irritation, redness, or hair loss on eyebrows or other body areas. In these cases, a professional evaluation is recommended to identify the underlying cause.

When to See a Hair Loss Specialist

Recognising when normal seasonal shedding becomes excessive is important. Consulting a hair loss specialist can help identify underlying causes and provide effective treatment options before permanent thinning occurs.

Signs You Should Get Checked

You should consider a professional evaluation if you notice:

• Excessive shedding lasting longer than 3–6 months
• Progressive thinning or widening of your hair parting
• A family history of male or female pattern hair loss
• Associated symptoms such as fatigue, menstrual changes, or scalp irritation.

Medical and Surgical Treatment Options for Hair Loss in Winter

Most winter-related hair shedding does not require medical or surgical treatment, as it is usually temporary and improves with good scalp care and nutrition. Treatment is only indicated when winter shedding worsens an underlying hair loss condition.

Medical treatment 

Medical treatment may be appropriate when hair loss is persistent, progressive, or consistent with a diagnosed condition such as androgenetic alopecia, rather than short-term seasonal shedding.

• Minoxidil

A topical treatment that supports hair growth by prolonging the anagen (growth) phase. It is used for androgenetic alopecia and may help maintain hair density when winter shedding makes thinning more noticeable.

Finasteride: An oral medication for men with androgenetic alopecia that reduces DHT, a hormone that gradually shrinks hair follicles in genetically susceptible individuals. Winter does not cause patterned hair loss, but treatment can slow the progression that may appear more obvious in colder months.

• Surgical treatment 

Surgical treatment is not appropriate for seasonal or winter-related shedding. It may be considered only when hair loss is established, and caused by conditions such as advanced androgenetic alopecia, and when medical therapy alone is insufficient.

• Hair transplant surgery

It involves moving healthy follicles from donor areas to thinning regions to produce natural-looking results. This option is reserved for carefully selected patients following specialist assessment and long-term hair loss stabilisation.

Conclusion

Hair loss in winter is usually temporary. Studies have shown that seasonal shedding peaks in late summer and early autumn, while winter mainly shows hair breakage, scalp dryness, and reduced hair volume. Cold weather, indoor heating, and lower vitamin D levels can make hair appear thinner, especially in people with existing hair loss conditions.

In most cases, winter-related changes can be improved with gentle hair care, proper scalp hydration, and good nutrition. However, excessive, progressive, or prolonged shedding should be medically assessed to rule out underlying hair loss conditions and guide appropriate treatment.

References 

1. Kunz M, Seifert B, Trüeb RM. Seasonality of hair shedding in healthy women complaining of hair loss. Dermatology. 2009;219(2):105–110. Available at: https://www.zora.uzh.ch/id/eprint/20699/1/216832.pdf
   
2. Liu C, Yang J, Qu L, Gu M, Liu Y, Gao J, Collaudin C, Loussouarn G. Changes in Chinese hair growth along a full year. Int J Cosmet Sci. 2014;36(6):531–536. Available at: https://onlinelibrary.wiley.com/doi/10.1111/ics.12151
   
3. Hsiang EY, Semenov YR, Aguh C, Kwatra SG. Seasonality of hair loss: a time series analysis of Google Trends data 2004–2016. Br J Dermatol. 2018;178(4):978–979. Available at: https://onlinelibrary.wiley.com/doi/epdf/10.1111/bjd.16075
   
4. Buontempo MG, Ingrassia JP, Shapiro J, Lo Sicco K. Seasonal trends in hair loss: a big data analysis of Google search patterns and their association with seasonal factors. J Eur Acad Dermatol Venereol. 2023;37:e1458–e1460. Available at: https://onlinelibrary.wiley.com/doi/10.1111/jdv.19364
   
5. Amor KT, Rashid RM, Mirmirani P. Does D matter? The role of vitamin D in hair disorders and hair follicle cycling. Dermatol Online J. 2010;16(2). Available at: https://escholarship.org/uc/item/8s34p6b7
   
6. Lee Y, Kim YD, Hyun HJ, Pi LQ, Jin X, Lee WS. Hair shaft damage from heat and drying time of hair dryer. Ann Dermatol. 2011;23(4):455–462. Available at: https://doi.org/10.5021/ad.2011.23.4.455
   
7. Rajput R. Influence of nutrition, food supplements and lifestyle in hair disorders. Indian Dermatol Online J. 2022;13(6):721–728. Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9650738/
   
8. Suchonwanit P, Thammarucha S, Leerunyakul K. Minoxidil and its use in hair disorders: a review. Drug Des Devel Ther. 2019;13:2777–2786. Available at: https://doi.org/10.2147/DDDT.S214907
   
9. Nestor MS, Ablon G, Gade A, Han H, Fischer DL. Treatment options for androgenetic alopecia: efficacy, side effects, compliance, financial considerations, and ethics. J Cosmet Dermatol. 2021;20(12):3759–3781. Available at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9298335/