The 3 Phases of Hair Growth

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We at FACE Medical Supply are experts at hair. We get hair and know what it takes for hair on the scalp to grow. His made up of 20 different cell types that each have their unique role in the growth of hair. The manner of hair growth occurs in distinct consecutive stages.  

The first stage of hair growth is called anagen and is the active growth phase. Telogen is the resting stage; catagen is the regression of the hair follicle phase, exogen is when the hair falls out of the scalp. Lastly, kenogen is the phase that occurs between the empty hair follicle and the start of a new hair follicle. 

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The structure of the hair is made up of:

  • Papilla
  • Hair Matrix
  • Root Sheath
  • Bulge

 The Papilla is the most massive structure and of a follicle and is located at the base of a single strand of hair. The Hair Matrix Surrounds the papilla. A Root Sheath consists of two different types of external and internal. The Bulge is found in the outer root sheath at the insertion point of the arrector pili muscle. It is home to several types of stem cells, which supply the entire hair follicle with new cells.

Anagen Phase. This phase is where 90% of hair growth occurs. During which the base of the hair is constantly dividing, adding to the hair shaft. The hair typically grows about 1 cm every 28 days. The hair on your head stays in this active phase of growth for 2–7 years.  

Catagen phase.  In this phase, an unknown signal is sent to end the continuous growth of hair. This stage lasts for about 2 to 3 weeks while the hair changes to become club hair. During this phase, the hair is cut off from its blood supply. This stops the cells from producing new hair. This process takes about two weeks to produce club hair, after which the hair enters the telogen phase.

Telogen phase. This is also referred to as the resting phase of the hair follicle. When the body is subjected to extreme stress, some hair can enter this stage prematurely, causing hair to fall out. Fifty to one-hundred club hair are shed daily from a healthy scalp. 

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Hair Diseases 

Androgenetic Alopecia – A form of hair loss in both men and women. For men, this is often referred to as “male pattern baldness.” Hair is lost in a recognizable pattern starting above the temples. Eventually, the hairline recedes to form a characteristic “M” shape. 

Researchers have discovered that this form of hair loss is related to hormones called androgens. Androgens are essential for healthy male sexual development before birth and during puberty. Androgens also have other vital functions in both males and females, such as regulating hair growth and sex drive.

Alopecia Areata – is a common autoimmune disorder that often results in unpredictable hair loss, and it affects around 7 million people in the United States. In most cases, hair falls out in small spots around the size of a quarter. For most people, the hair loss is nothing more than a few places, though in some cases it can be more extreme. 

Alopecia Facts

  • Tends to be genetic
  • Develops suddenly, over just a few days.
  • Is not caused by stress
  • Fully recoverable 
  • There is no cure for alopecia areata, goes away suddenly.

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All content in this blog is for informational purposes only. It is not medical or legal advice. Please consult with lawyer or a medical professional.