Causes of Hair Loss
There are many reasons that cause hair loss. A diet lacking in essential nutrients, thyroid problems, infections, stress, anemia, excessive cosmetics (dyes, straightening iron), are factors that undoubtedly collaborate with alopecia.
The side effects of some treatments can also cause hair loss. Chemotherapy or radiation is one example.
However, Androgenetic Alopecia or Androgen is the most common and affected in some way, to most men.
90% of men older than 21 years show a downturn in the frontotemporal area (inputs) and 50% of men over age 40 have the crown area depopulated.
To be clear, 5 of 10 men (over 40) suffer from alopecia in both areas of the scalp and 9 out of 10 (higher than 21 years) with alopecia only in the entries (see left column).
Remember it is absolutely normal to lose about a hundred hairs a day. Alopecia is diagnosed when new hairs are thinner than normal. We must not confuse a "hair thin" with alopecia because there are many people who have always had fine hair or looks weak. This does not necessarily mean alopecia.
In androgenetic alopecia, responsible for hair loss are the enzyme 5-alpha-reductase and the hormone testosterone. The enzyme converts testosterone into dihydrotestosterone (DHT), who ultimately is responsible for reducing the follicles, causing the membranes of the scalp from becoming rigid.
Thus, the follicular structure receives less blood supply and new hairs are weaker than normal and fine.
At the end of the process, the follicles atrophy and hair that falls out is not replaced by new hair.
We have studied the levels of DHT in individuals with androgenetic alopecia usually normal. Therefore, science has determined that there is a high level of DHT which causes hair loss but a particular sensitivity of the follicles against DHT.
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