Hair Growth Explained

Hair is formed at the base of a hair follicle. A follicle resembles a pouch that is located below the skin. What we usually call hair is actually the hair shaft, which is nothing but hardened tissue that grows from a follicle.

Our head contains thousands of hair follicles. However, all of them are not active at the same time. It has been observed that not more than 80% of our follicles are producing hair growth at any one time. The remaining 20% of the follicles are asleep or dormant.

Then our inactive or dormant hair follicles start working again, they push out an old hair while producing a new one. Our hair grows from the follicle at an average rate of one-half inch every month. The hair growth continues for a period varying between four and seven years, after which there sets in a ‘resting’ phase. After this resting phase, it is time for the hair to fall out.

As a hair falls out, a new hair grows in its place after a gap of three weeks to three months. There are chances of us losing 50 to 100 hairs in any day. Some of us lose even more than that, not to regrow hair back again.

Hair grows differently from person to person, depending on age, weight, metabolism, hormones, ethnicity, medications, Genes. However, our hair growth effectively covers three distinct phases: anagen, catagen and telogen. The anagen phase is also called the active growth phase. This phase continues for several years. At any given time, the major portion (85%) of our body hair is found to be in this phase.

During this anagen phase, the hair has an abundance of melanin (Pigment). The catagen or the regressive phase lasts for a period of nearly two weeks, during which the hair stops growing but has not yet shed. It has been observed that about 3 – 4% of our body hair is in this phase at any given time.

The telogen phase or the resting phase continues for 5 – 6 weeks, at the end of which the hair falls out and a new hair begins to take shape. Nearly 10-13% of our body hair is in this phase at any given time.

There is an extensive loss of hair when more hair enters and stay in this phase. Research has established that the shock caused to the human system by stress and sickness can result in a larger percentage of hair staying in the resting phase, leading to reduced active hair regrowth along with an accelerated period of loss of hair.

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