Medically Reviewed by Dr Ali, FRCP (Edinburgh), FRCP (London), MBBS, MRCS, LRCP, DCH, DRCOG, MRCGP
If you’ve noticed more hair in your brush or shower drain during certain times of the year, you’re not imagining things. Seasonal hair loss is real, and for many people, it’s completely normal.
In this post, we’ll explain what seasonal shedding is, why it happens, when it tends to occur, and how to tell the difference between normal shedding and something more serious. We’ll also cover practical tips to manage it.
What Is Seasonal Hair Loss?
Seasonal hair loss refers to an increase in hair shedding during specific times of the year—typically late summer through fall, or sometimes in the spring. It’s usually temporary and part of the hair’s natural growth cycle.
We all shed hair daily (about 50–100 strands), but during seasonal shedding, that number can rise noticeably. While this can be alarming, it’s often nothing to worry about.
What Causes It?
The exact cause of seasonal hair loss isn’t fully understood, but several factors may contribute:
1. Hair Growth Cycles
Your hair grows in phases:
- Anagen (growth phase)
- Catagen (transition phase)
- Telogen (resting/shedding phase)
Seasonal changes, especially in sunlight and temperature, may influence how many hairs enter the telogen phase. More telogen hairs = more shedding.
2. Sun Exposure in Summer
Some studies suggest that increased sun exposure during summer can push more hair follicles into the resting phase, leading to shedding a few months later (usually in fall). Think of it like a delayed response.
3. Temperature and Humidity Shifts
Cooler, drier air in the fall and winter can affect your scalp’s health. Dry skin can lead to inflammation, itchiness, and more breakage or shedding.
4. Vitamin D Levels
Your body makes vitamin D from sunlight. When daylight hours drop, so do vitamin D levels—which can impact hair follicle health and contribute to shedding.
When Does It Happen?
For most people, seasonal shedding happens:
- Late Summer to Fall: This is the most common pattern, especially for women. It’s often most noticeable from August through October.
- Spring: Some also experience a smaller shedding peak in April or May, likely due to winter-related stress on the scalp or internal vitamin shifts.
Who’s Most Affected?
Anyone can experience seasonal hair loss, but it’s more noticeable in:
- Women: Because they typically wear their hair longer, shedding is more visible.
- People with longer or thicker hair: You’ll see more hair coming out even if the number of lost strands is normal.
- People under stress or with nutritional gaps: Seasonal changes can amplify other underlying issues.
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