Hair facts you should know
- Average person’s head has 100,000 to 150,000 hairs.
- Black hair is the most common hair color.
- 2% of world population has blonde hair.
- You must lose over 50% of your scalp hairs before it is apparent to anyone.
- Over 50% of men by age 50 have male pattern hair loss.
- 40% of women by the time they reach menopause will have female pattern hair loss.
- Hair is the second fastest growing tissue in the body. Only bone marrow is quicker.
- Hair is strong as a wire of iron. A single hair can support up to 100 grams in weight and a whole head of hair could support up to 12 tonnes. It rips after applying a force equivalent to 60kg, only after it stretched itself for about 70%.
- A hair grows by 0.3 to 0.5mm per day – about 1 to 1.5cm a month and 12 to 15cm a year.
- 16 km (10 miles) is a yearly gross product per head of hair.
- A single hair has a thickness of 0.02 – 0.04mm.
- Children lose an average of 90 hairs each day, which increases to 120 by old age.
- Women often experience major, but reversible, loss of hair two or three months after giving birth. The massive production of the hormone oestrogen during pregnancy puts hair follicles into their ‘growth phase’.
- Maximum length of hair is 70 to 90 cm.
- Lifespan of hair is 2 to 7 years.
- Hair grows faster in warm weather.
- Cutting hair does not influence its growth.
- An anticipation of sex makes hair grow faster.
Most commmon hair loss myths
Wearing hats causes hair loss
Hats worn by men whose hair is thinning doesn’t cause baldness — it hides baldness. However, many people believe that hats cause baldness based on the idea that hats cut off air circulation to the scalp and prevent the scalp from breathing. But in fact, hair follicles get oxygen from the bloodstream, so you can’t suffocate your hair follicles just by wearing a hat. On the other hand, hats that fit tightly on the head may cause thinning around the sides of the head where constant traction is applied to the hair.
I am balding, because my hair is falling out
This is a myth. You go bald because your normal, thick hair is gradually being replaced by finer and thinner hair. It is normal to lose about 100 hairs daily but your body will replace what’s lost.
Excessive use of shampoo, colors or hot irons kills your hair
Your hair isn’t alive, so you can’t “kill” hair. As long as the damage is limited to the hair and not the hair follicles below the skin, hair above the skin may be lost from breakage or damage, but it will regrow from the follicles.
Decreased blood flow causes hair loss
Another myth says, that standing on your head increases the flow of blood to your scalp and improves hair growth. It is true, that growing hair does require a significant amount of blood, but once you lose hair, blood flow to your scalp decreases because there is no need for it with no hair up there. So decreased blood flow to the scalp isn’t the cause of the hair loss but the result of it.
Frequent haircuts will make your hair grow back thicker
Once you cut your hair it’s not thicker — it’s just shorter. Hair grows on average at a rate of a 1 to 1.5cm per month whether you cut it daily or get a haircut only once a year.