Causes of hair loss

There are many reasons why hair begins to fall and in some cases to total baldness.
One of them even if not the most important is the food devoid of nutrients and vitamins essential to hair health, other causes are diseases of the thyroid, stress, scalp contact with different chemicals harmful to the hair follicle, the hygiene of the scalp, some contraindications to some medications (usually antidepressants) and in cases of AGA undoubtedly the most important factor is genetics.

The most common hair loss are genetic and covers the vast majority in men over 40 years and a smaller but no less important in older than 21 years although there are cases in which hair loss is usually be before or after this.
Hair loss is often first and more on inputs and on the crown.
While it is normal to lose 100 hairs a day or more, making believe that one is being bald is not the hair loss itself, but not lost her hair to grow back with the same vitality, they begin to grow thinner and clear to the point that in cases not re-grow.

The culprit of all this is the enzyme 5-alpha-reductase and the hormone testosterone. The enzyme converts testosterone into dihydrotestosterone (DHT) which is reducing the follicles causing the membranes in the scalp to become rigid.

This creates less blood, and the new hair to emerge are weaker, thinner and clear up and not play more atrophy hair down.