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Hair Structure And Hair Growth Cycle


Human hair contains two main parts.

Hair root: That is below the scalp.

Hair shaft: The part of the hair that grows out that you see.

Follicle is a tube like area which contains the hair root

Sebaceous gland- They are the glands of the skin that secretes sebum oil. Sebum gives lubrication to the skin, scalp, and hair.

Hair shaft- This is the part of your hair which grows out from your skin. Shaft consists of an outer layer known as a cuticle, a middle layer known as the cortex, and an inner layer known as the medulla (fine hair does not have a medulla layer)

Hair Growth Cycle

Understanding hair growth cycle and its facts is very important as there are various myths about how hair grows. There are 3 phases of hair growth cycle and these phases keep repeating. A person on an average grows about 1/2 inch of hair every month.

Anagen Phase

In this phase, new hair grows and this phase usually lasts for about 3 to 5 years but can be even longer in some people. When you see any individual with highly long hair, this is because they probably might have a longer than average anagen phase. At one time, about 90% of hair is at this phase.

Catagen phase

In this phase, hair begins to a transition that is into a rest phase. This is considered the end of the growth phase. Say about 1% of hair is in this phase that is at one time. This has been the shortest phase that only lasts for a couple of weeks.

Telogen phase

In this phase, hair will no longer be growing and sheds eventually. About 10% of hair is in this phase at a time. This phase usually lasts for about 3 to 6 months.

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