The people are on average between 70-100 hairs per day, the term hair loss is somewhat misleading, because the unusual hair is usually replaced permanently. It depends on how easily and how many fail in the areas where hair.
We are told often that to 100 hairs per day were normal. That may (be right for an average number of available head hair), but applies only if the hair loss is spread relatively evenly over the whole head. Focused on individual hair loss areas (alopecia areata) or only on the top of the head (androgenetic alopecia), this is rather worrying.
Cause of the often referred to as hereditary hair loss (alopecia or androgenetic alopecia androgenetica by androgens induced as hair loss) is the steroid hormone dihydrotestosterone (DHT). Induced as a result hair loss is genetic.
When present in the scalp and much DHT is an inherited sensitivity for this is, the growth phase (anagen) of hair shortened. A bald man has accordingly not less hair follicles than a man with full hair growth, only the growth phase of hair is shortened so that – for example, comparable with the little hairs on the forehead – prominent barely visible. The hair follicle atrophy so gradually, due to hypersensitivity to DHT. Resistant to DHT, the hair in the back and neck area, this is therefore not even at a transplant to the skull.
DHT is created from the conversion of the hormone testosterone by the enzyme 5?-reductase. DHT is very important for the development of the male embryo / fetus and later, at puberty for the development from boy to man What functions and the importance of DHT after puberty is completed, not yet fully understood. It seems to hereditary predisposition, but a link between DHT and prostate disorders.
We speak in connection with androgenetic hair loss in adult male, for which that occurs in families and usually on the forehead and temples begins, also of Alopecia praematura or simplex. Therefore, many drugs (eg, Propecia ®, Pantostin ®, Ell-Cranell ® alpha) to reduce the effect of DHT or inhibit the formation of testosterone.
The treatment of hormone tumors such as breast cancer with aromatase inhibitors, can also develop women with genetic predisposition androgenetic alopecia.
The following resources may help you: