Hair Growth Cycle-
Fine thread-like strands growing from follicles, roots or skin are called hair. The process of hair growth is followed by multiple phases that is called hair growth cycle. Our hair passes through four stages of growth- anagen, catagen, telogen & exogen. Each hair faces different stages throughout the process of growing to shed.
Defining Different Stages of Hair Growth-
Anagen (Growing Phase)-
It is the active growth state of hair. In the phase, hair grows actively from the follicles. It is the only time when hair is growing. The period may last 2-7 years. It determines the depth and length of hairs.
Catagen (Transition Phase)-
The Catagen phase may last up to 10 days. In the process, hair follicles shrink and hairs get detached from Dermal Papilla (at the root of hair follicle) and move upwards to the base.
Telogen (Resting Phase)-
Telogen or resting phases of hair growth cycle that lasts for 3-4 months. In the phase, old hairs stay in resting phase and new hairs begin to enter growing phase. 10-15 percent of hair continually facing this phase.
Exogen (Shedding Phase or New Hair Phase)-
In Exogen phase old hairs start shedding (with the rate of 50-100 hairs a day that is considered normal by doctors) and new hairs continues to grow.
Hair Growth Cycle And Hair Loss-
The numbers of hair cycle are limited and we can face 25-30 hair cycles during our entire life that is enough to fill your head with hairs full life.
Doctors say 50-100 telogen hair shed is considered as normal hair loss. The hair loss can be seen when bathing or applying comb on the scalp. These hairs will regrow.
But what if hairs are shedding more and stop growing?
Hair growth cycle may be affected by various reasons and cause hair loss disease (Alopecia) resulting in heavy hair loss. The reasons may be medications, radiation, chemotherapy, extreme illness, physical and emotional stress, low consumption of nutrition, hormonal changes, thyroid disorders and more.
Also, androgen levels (testosterone, dihydrotestosterone) in the body plays an important role in human hair growth. Androgens are necessary hormones for the growth of hair on beard, underarm and pubic. The growth of scalp hair is not androgen-dependent but might be a vital component in affecting hair growth cycle and in the development of male and female pattern hair loss also called Androgenic Alopecia.
Hair loss is among the most found health issues in people nowadays. Affected hair growth cycle can cause heavy and permanent hair loss. It is vital to consult a good hair specialist and taking a suitable treatment.