Hair school
All about hair: growth, summer and common questions
Knowledge about how hair grows and what affects it—whether you want to optimise daily habits or understand the difference between seasonal change and pathological hair loss.
Does summer affect how fast hair grows?
There is truth in the idea that hair often grows a little faster in the warmer months. Here we summarise what research and clinical experience usually point to—and how to think about sun, heat and the scalp in a healthy way.
Scientific support
- Hair often grows somewhat faster in summer—differences are measurable for many people.
- Several factors interact: heat, humidity, more sunlight and vitamin D, often lower stress.
- Individual differences are large; biology and health always matter.
Why can growth increase in summer?
Increased blood circulation
Heat and movement increase blood flow in the scalp. Better circulation gives follicles more oxygen and nutrients—a good environment for the growth phase (anagen).
Vitamin D and sunlight
We often spend more time outdoors in summer. Vitamin D matters for cell function and the follicle environment and can help support an active growth phase.
Less stress and better recovery
Holiday, lighter evenings and more relaxation can lower stress load. Chronic stress can otherwise worsen scalp environment—so lifestyle matters year-round.
Hair phases in brief
Hair grows in cycles: anagen (growth), catagen (transition) and telogen (rest before shedding). Summer factors can favour an active anagen phase for many—but the whole scalp is never in the same phase at once.
Read more about structure and the growth cycle on the hair loss pageHow to support hair growth in summer
- Move regularly—exercise boosts circulation.
- Gentle scalp massage can complement (not replace medical treatment for hereditary loss).
- Avoid extreme heat styling routines that stress the strand.
Protect the scalp from strong UV
Sun and vitamin D can be positive in moderation—but intense UV can irritate the scalp and make hair dry and more prone to breakage.
- Use a hat or cap in strong sun—protect both skin and hair.
- Avoid long exposure at peak UV; protect the scalp.
- Moisturise after swimming and sun—especially if hair is chemically treated.
Hair care
- • Wash away sweat and salt after swimming; follow with gentle care.
- • Use heat protection if you blow-dry or style often.
Diet & fluids
- • Protein, iron, zinc and a balanced diet support hair building blocks.
- • Drink enough—especially in heat.
Combine with professional care
If you want extra scalp support, PRP and individual treatment plans may be relevant—especially if you also see thinning or clearly increased shedding.
Read about PRP treatmentLosing more hair in autumn?
It may be seasonal and linked to the growth cycle—often more shedding is noticed when many hairs enter telogen at once. We explain the difference between normal autumn shedding and medical hair loss on our hair loss page. Read about seasonal hair loss
In summary, it is not a myth that hair often grows a bit faster in summer—but think holistically: protection from intense sun, balanced lifestyle and the right assessment if you worry about thinning. Contact us for a free consultation.