This article was sponsored by the American Center for Physical Therapy

The definition :

It is hereditary hair loss that depends mainly on androgen (male sex hormone).

It mainly affects males in their twenties or early thirties, and it may affect females at a later age.

The reasons :

  • Heredity: Some studies have proven the existence of autosomal dominant inheritance with different influences, and this explains why some families are affected and not others.
  • Androgens: Baldness mainly occurs after puberty, and does not affect people who have been castrated before puberty. Also, baldness returns and appears in them when they are given testosterone (the male androgen hormone), then it returns and stops by stopping it, which confirms the role of the androgenic center in its development.

Knowing that the role of testosterone in causing baldness has not been known, except for experiment and observation only.

Baldness development mechanism:

A hair generally passes through 3 phases:

  • Growth stage: an average of 3 years
  • Catagen phase: an average of 1-2 weeks
  • Completion phase: average 3-4 months

What happens in baldness is a decrease in the growth period compared to the end period, which reduces hair growth, so the follicle continues to produce fine and fine hair until it stops producing hair.

Clinical examination:

Baldness occurs in the twenties in general, it may be delayed or start early, and the early onset is considered a bad warning. You do not see an increase in hair loss, but we see a decrease in hair density.

It usually goes through the following stages as it progresses:

  • Natural hair.
  • Receding hair at the two temporal angles.
  • Frontotemporal retraction.
  • Strip top.
  • Full nudity between the forehead and the temples and the summit.

As for women, the problem begins after the age of forty, as they pretend to lack density at the top, so that the back and side sides remain with a normal density.


Minoxidil: at a concentration of 2-5%, it improves hair growth and increases the length of hair and the growth period.

Negative: baldness returns when the drug is stopped

Finasteride: given at a dose of 1 mg per day, noting that it is never given to pregnant or breastfeeding women.

Finally, there are surgical methods whose principle depends on transferring grafts or slices from places of natural hair to deficient areas.

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