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This growing phase lasts for 2 to 6 years and each hair grows approximately 1 centimeter per month during this phase. About 90 percent of the hair on the scalp is growing at any one time. It is normal to shed some hair each day as part of this cycle, but some people may experience excessive hair loss. Hair loss of this type can affect men, women and children and it could be annoying problem.
What is hair loss?
Partial or complete loss of hair is called alopecia. Hair loss usually develops gradually and may be patchy or diffuse, occurring all over the scalp. Roughly 100 hairs are lost from your head every day, and an average scalp contains about 100,000 hairs. Each individual hair survives for an average of 4-1/2 years, during which time it grows about half an inch for a month. Usually in its 5th year, the hair falls out and is replaced within 6 months by a new one, but genetic baldness is caused by the body’s failure to produce new hairs and not by excessive hair loss. Both men and women tend to lose hair thickness and amount as they age, although inherited or pattern baldness affects more men than women. About 25% of men begin to bald by the time they are 30 years old. About two-thirds are either bald or have a balding pattern by age 60. Typical male pattern baldness involves a receding hairline and thinning around the crown with eventual bald spots, and ultimately man may have only a horseshoe ring of hair around the sides. In addition to genes, male-pattern baldness seems to require the presence of the male hormone known as testosterone. Men who do not produce testosterone because of genetic abnormalities or castration do not develop this pattern of baldness. Some women also develop a particular pattern of hair loss due to genetics, age, or male hormones.
These male hormones tend to increase in women after menopause. The pattern is different from that of men, because female pattern baldness involves a thinning throughout the scalp while the frontal hairline generally remains intact.