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Do you feel that you are the only one losing hair? You're not! The most common form of hair loss, Androgentic Alopecia, or pattern baldness, is experiences by 50-80% of Caucasian men. The number of Chinese males affected are half of the Caucasian counterparts while African Americans have a lower incidence of the condition as well. For women Androgenetic Alopecia occurs between 20-40% of the general female population. In summary, it is safe to say that pattern baldness is experienced by the norm of the population, you're not alone, but actually in the majority.
Androgenic Alopecia develops when the hair follicle (the place under the skin where hair grows from) experiences a reduction in size, as well as a time reduction in the active growth phase. This translates into a simple fact: that more and more of the hair follicles will spend time in the resting state where hair is shed once the state is completed. Fortunately, Androgenic Alopecia does not develop in all hair follicles at the same time. This is why some part of the scalp seems to be losing more hair than the other.
What causes Aandrogenic Alopecia? As boys grow up, their hair follicles are exposed to Androgen (any hormone that controls the appearance and development of masculine characteristics) that their body has synthesized. Once hair follicles are exposed to Androgen, they become "Androgen sensitive" and Androgenenitic Alopceia can develop latter in time. Stopping the hair follicles from interacting with Androgens seems to prohibit any chance of Androgenetic Alopecia development.
To put it in a more detailed explanation there are two types of androgen that need to be considered: Testosterone and DHT (Dihydrotestosterone). An Enzyme called 5-Alpha-Reductase converts Testosterone to DHT. Once DHT is formed, it has the ability to bind to any Androgen receptor in hair follicles. This binding reduces follicle activity, shrinks the hair follicle, which in turn slows the hair growth cycle, reduces the diameter of the hair shaft and over times hair growth ceases.
For females, the mechanism of the condition is similar to that of the males. The source of the Androgen is the combined activity of the Ovaries and the Adrenal glands. Hair loss in women can many times be directly related to pregnancy or menopause and their effects.
Why do some people seem to have more extensive hair loss than others? Recent research suggest that the answer has something to do with the differences in the concentration of 5-Alpha-Reductase in skin and hair follicles of people who have Androgenetic Alopecia. It is possible that some people just produce more of this enzyme, which in turn converts more Testosterone to DHT, which will result in greater hair loss. Also, some people just develop greater sensitivity of Androgen receptors in their hair follicles. This means that a certain concentration in others with less sensitive Androgen receptors in the follicles.
A. Male
It is true that Androgenetic Alopecia is the most common hair loss suffered by males. However, there are other causes of hair loss that you need to be aware of:
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All of these only represent 5% of the hair loss found in general male protection; Androgenetic Alopecia is the norm.
If you experience Androgenetic Alopecia, more likely than not your hair loss will be limited to the top of the head and may or may not involve thinning and / or receding hair lines.
B. Female
It is probably the best kept that secret: hair loss in females is a common thing. As mentioned above, the most common type of hair loss for women is Androgenetic Alopecia, The female pattern baldness is seen as hair thinning predominantly over the top and sides of the head. Androgenetic Alopecia in women is most commonly seen after menopause, although it may begin as early as puberty. How can you be sure that you're not actually experiencing hair loss? Normal hair falls approximately 100 -125 strands per day; true hair loss occurs when the loss is not replaced or when the daily hair shed exceeds 125.
Sudden hormonal changes when starting or stopping contraceptives, starting or ending a pregnancy, the start of menopause, all has been characterized as the promoter of Androgenetic Alopecia. The two key events in a life of a woman might promote this onset: pregnancy and menopause. WHY? Simply because menopause causes permanent changes in hormone production, the Adrenal glands also undergo changes during menopause. The overall result is a reduction of "Androgen Antagonist" such as Oestrogen and a net increase in Androgen; as we have elaborated before, Androgen is directly responsible in hair loss.
Physical and emotional stress might cause hair loss since body is recuperating from an overwhelming turmoil and simply shuts down hair production, thinking that it is not necessary for the body's survival, thereby contributing all energy toward repairing vital body parts. There can be up to three months delay between the major incidence and the actual hair loss. Moreover, there is also period of three months before the lost hair is replaced. This then means there is a total of a minimum of 6 months for the total hair loss and regrowth cycle. Of course there are things that might contribute to hair loss such as Anaemia, low blood count, and Thyroid abnormalities.
Chemotherapy agents are basically poisonous chemicals administered to kill Cancer cells. Unfortunately, they kill more than just cancer cells: they hurt healthy cells as well, including hair cells. Usually the patient loses a huge amount of hair during treatment and there is no hair growth stimulant, i.e. shampoos or conditioners that can reverse this effect. The good news is that once chemotherapy is completed, hair usually grows back. Adequate hair growth may take anywhere from 6 -12 months.
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