Causes of Androgenetic Alopecia
What is the cause and how is it produced?
In androgenetic alopecia, the fundamental phenomenon, both in men as in women, is the progressive miniaturization of hair follicles in certain areas of the scalp, just transforming from terminal hair (scalp hair itself from the 3 – 4 months old, resulting from the transformation of body hair after the effect of androgens) to hair, and finally disappears.
This is a spontaneous and irreversible and that usually starts from adolescence due to increased numbers and activity of androgens. Several androgens may act on the follicle with a different activity level, the most active hormone dihydrotestosterone.
Areas sensitive to the activity of androgens are above the middle of the forehead and crown in man, and all the upper and central head at the woman as the degree of sensitivity and therefore the tendency to develop androgenetic alopecia, given by a heritage that is passed from parent to child with a variable intensity (the famous family tradition).
The pattern of androgenetic alopecia in men ranges from the accentuation of the entries, to diffuse loss in the middle above the forehead and/or the crown, to the loss of all hair except on the margins located back and sides of the head. The fundamental difference with women is that they fail to remain completely bald. Women have diffuse hair loss, often with more involvement in the upper center, without receding hairline hair, and may be visible scalp.
Therefore, in androgenetic alopecia is a shortening and thinning of hair, called miniaturized hairs. These hairs show a significant loss of diameter and length and are the defining feature of androgenetic alopecia. Baldness hair becomes long, thick, pigmented hair into fine, lighter and fluffy.
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