Hair Loss
We each have about 100 000 hairs on the scalp. It is normal to lose 50–100 hairs from the head each day.
Each hair on the head grows for about 5 years before being shed
Eyebrow hairs grow for only 10 weeks
Scalp hair grows at a rate of about 1 cm (just under half an inch) a month
A survey has shown that about 7.9 million men and 1.6 million women in the UK have hair loss problems.
Each year, American men spend about $900 million on efforts to regrow hair.
In the USA and UK, there has not been a bald President or Prime Minister since the television age began.
Hair loss is a big worry to many people, both male and female. If you have a worrying amount of hair in the basin after shampooing, you may think you are on the way to baldness. But this is not usually the case. The 50–100 hairs that everyone loses each day often become tangled with the rest of the hair, but are washed out when we shampoo. So we see what seems like a lot of hair in the basin after shampooing, but in reality these hairs have been shed earlier.
Of course, bald areas are an obvious sign of hair loss, but otherwise it can be difficult to tell whether your hair is getting thinner. To find out, try the ‘tug test’. Hold a small bunch of hair – about 15 or 20 hairs – between the thumb and index finger. Pull slowly and firmly. If more than six hairs come out there may be a problem.
How hair grows
The portion of the hair that we can see is called the shaft. Each shaft of hair protrudes from its follicle, which is a tube-like pouch just below the surface of the skin. The hair is attached to the base of the follicle by the hair root, which is where the hair actually grows and where it is nourished by tiny blood vessels.
Like the rest of the body, hairs are made of cells. As new cells form at its root, the hair is gradually pushed further and further out of the follicle. The cells at the base of each hair are close to the blood supply and are living. As they get pushed further away from the base of the follicle, they no longer have any nourishment and so they die. As they die, they are transformed into a hard protein called keratin. So, each hair we see above the skin is dead protein. It is the follicle, which lies deep in the skin, that is the essential growing part of the hair.
The thickness of each hair depends on the size of the follicle from which it is growing. At puberty in boys, hormones increase the size of the follicles on the chin, chest and limbs so that each hair becomes more thick and wiry. In the elderly, the follicles shrink and the hair becomes finer.
Another reason might be interference with the formation of new hair cells at the root during the growing phase; this occurs with some anticancer drugs. If follicles have been destroyed (as they might be by, for example, a burn or by some skin diseases), there will be baldness in that area.
An individual can also look bald if the hairs are growing but are so fragile that they break just as they emerge from the follicle, or if they are very small and thin.
In 1998, scientists at Columbia University in New York announced the discovery of a gene that appears to be the ‘master switch’ for hair growth. They found the gene after comparing the genes of hairless mice belonging to a mutant breed, and comparing the genes of 11 members of the same family who had lost all their hair. This discovery is a step towards understanding how the hair follicle works and how baldness happens, and may lead to effective treatments in the future
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