Why Does Hair Grow Faster In The Summer? [Scientific Reasons]

Why Does Hair Grow Faster In The Summer

Have you ever noticed that your hair seems to grow faster during the summer months?

This is not a mere coincidence or an illusion, but a scientifically observed phenomenon.

In this article, we will explore the reasons behind this summer hair growth spurt and compare hair growth rates between summer and winter.

Why does hair grow faster in the summer?

woman sitting on rock near body of water

Hair growth is a complex process influenced by various factors, one of which is seasonal variation. Studies have found that human hair grows faster in the summer compared to the winter.

This is primarily due to the increased circulation of blood in warmer temperatures, which delivers more nutrients to the hair follicles, promoting faster growth.

Additionally, the body produces more human growth hormone (HGH) during the summer months. HGH plays a crucial role in promoting cell reproduction and regeneration, which directly impacts hair growth.

Furthermore, increased exposure to sunlight during summer also contributes to faster hair growth. Sunlight stimulates the production of Vitamin D, a critical nutrient for healthy hair growth.

Why does body hair grow faster in the summer?

Similar to the hair on your head, body hair also tends to grow faster during the summer months.

The reason is the same – increased blood circulation and hormone production in warmer weather. This is why you may find yourself shaving or waxing more frequently during the summer.

Why does hair grow slower in winter?

In contrast to the summer growth spurt, hair tends to grow slower in the winter months. This is due to several factors.

Firstly, colder temperatures constrict blood vessels, reducing blood flow and, consequently, the supply of nutrients to the hair follicles.

Additionally, the body produces less HGH in winter, further slowing down the hair growth process. Lastly, lack of sunlight and lower Vitamin D levels can also negatively impact hair growth.


In conclusion, it’s perfectly normal to notice faster hair growth in the summer and a slowdown in the winter. This seasonal variation is a result of changes in blood circulation, hormone levels, and Vitamin D production.

So, the next time you observe a hair growth spurt during the summer months, remember, it’s all part of your body’s natural response to the changing seasons.

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