Summer is quietly changing your body, and your fingernails prove it

Many people notice their nails seem to grow faster during summer holidays or in warmer countries. But is the heat actually speeding up nail growth, or does it just feel that way? Research suggests the answer is more complicated than a simple yes or no. While some studies point to a slight seasonal increase in nail growth, decades of observation by one physician tell a different story. Here's what scientists have found, as per Science Focus and IFL Science.

Do nails really grow faster in summer?

It’s a common belief that fingernails grow faster during summer or while spending time in a hot country. According to research, there is some truth to that idea, although the effect appears to be small.


As reported by IFLScience, several studies have found a slight increase in nail growth during the warmer months. Researchers believe this may be linked to increased blood flow to the fingertips, allowing more nutrients to reach the nail. However, not every scientist reached the same conclusion.

One of the most unusual investigations into nail growth began in 1941, when American physician William Bennett Bean started monitoring his own fingernails. Every month for more than three decades, he marked his nails and carefully measured how much they had grown.

After 35 years of observation, Bean concluded that climate, season and geographical location had no measurable effect on his nail growth.

Even so, he acknowledged that other research supporting seasonal changes had "good evidence." He believed his own results may have differed because he spent much of his time indoors with central heating and air conditioning, limiting exposure to changing weather conditions, as per Science Focus.

Scientists today generally agree that nails should grow somewhat faster during summer, although the difference is usually modest.

Why does warm weather make a difference?

Researchers believe warmer temperatures may increase circulation throughout the body, including the fingertips. Better blood flow means more nutrients can reach the nail, potentially encouraging slightly faster growth.

Still, if your nails suddenly seem much longer while you're on holiday, the reason may not be faster growth alone. Relaxing by the pool or spending time away from everyday activities means your nails are often exposed to less wear and tear. Instead of being constantly chipped or worn down, they simply remain intact, making the growth more noticeable.

Hair may also grow a little faster in warmer weather, although the evidence is less convincing than it is for nails.

What else affects nail growth?

Temperature is only one possible influence. Hormones, nutrition, genetics and age all play important roles in determining how quickly nails grow. Bean's research also uncovered several interesting patterns. He found that nail growth slowed sharply after the age of 40 rather than declining gradually.

He also observed that illnesses affected growth differently. Mumps almost stopped nail growth, while influenza caused a less dramatic slowdown. Injuries and nail blemishes, meanwhile, generally grew out naturally over time.

Other research has shown that growth rates can vary between fingers. The middle and fourth fingers often grow slightly faster than the thumb and little finger. Nails on a person's dominant hand also tend to grow more quickly than those on the non-dominant hand.



Overall, the available evidence suggests that warmer weather may provide a small boost to nail growth. However, everyday factors such as age, health, genetics and even how much your nails are worn down continue to have a significant influence.

FAQs

Q1. Do fingernails really grow faster in summer?
Yes, some studies suggest a slight increase, although the difference is usually small.

Q2. What affects nail growth the most?
Age, genetics, hormones, nutrition, health and blood circulation all play important roles.