The amount of hair that grows on each person is determined by heredity. Certain genetic factors such as hair color, type, thickness and amount of hair is all part of what a person is born with. At different times in life, genes may be turned off or turned on, and the best way to determine what your hair qualities may be, is by taking a look at your parents.
Heredity
Genetics play a vital role in determining normal hair growth, as well as abnormal hair growth. Abnormal hair growth may be inherited, or could stem from hormonal imbalances, malnutrition, medication or from cysts and tumors formed in the ovaries, according to the American Academy of Dermatology. Some conditions that are found to be hereditary include; hirsutism and polycystic ovary syndrome.
Hair Follicle
Hair follicles are tiny-organs found on the skin which were created during fetal development, and are specifically designed to create hair. Within the hair follicle, there are three phases that hair is constantly going through; anagen, catagen and telogen. This cycle will continue throughout a person's life, but certain factors could destroy the hair follicle, and inhibit the production of hair. According to Hair Biology, "factors may include adverse reactions to drugs and cosmetics, or as a result of scarring, tumors, radiation, the genetics of the individual, hormones and/or their immune system."
Function
There are a few important reasons behind why people are physiologically born with hair on their body. Hair regulates temperature for the body, it provides physical protection, it activates senses, it is a camouflage in particular seasons and it helps with interacting socially. According to Science Daily, Leif Carlsson and his team of researchers found that the Lhx2 gene activates the hair follicle during the growth phase, in then which the hair formed.
Types
There are two types of hair that is grown on the body. Vellus hair is often referred to as "peach fuzz," and this hair is found to be very light, fine and short. Terminal hair is much longer, darker and coarse. Androgen production, a sex hormone produced by both men and women, changes the hair from vellus to terminal. Hirsutism is the excess production of terminal hair in regions of the body that women do not normally produce hair. The places include; the chest, back, face, stomach and upper thighs.
Considerations
Hormones, genetics and medical conditions can all affect hair growth. Knowing your family history of medical conditions could keep things in perspective, and help you realize that you also could be affected. If the hair growth has become excessive, seek medical advice. It is best to get treatment for medical conditions that may be affecting your life, and treatment options are available in removing unwanted hair.
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