This is commonly referred to as Common baldness of men and women or androgenetic alopecia
Root Cause of the Problem :
Seventy percent of Men and fifty percent of Women will experience some degree of pattern baldness in their lifetime. The cause of baldness is no longer a mystery. Research has confirmed that hair loss is inherited like the color of the eyes. The gene can be inherited from the mother’s or father’s side.The hair follicles are genetically coded. If hair loss genes were present, the hair follicles on top of the head possess receptors, which are sensitive to the hormone dihydrotestosterone or DHT. These hair follicles which are genetically “Programmed”, begin shrinking in adulthood.When this occurs, the hair follicles grow finer and smaller, lighter in color, shorter and less deeply rooted than their predecessors-hence they are called Miniature Hairs. The severity increases with age progressively and relentlessly. In most cases, this “Thinning Hair” will progress to “Baldness” when the shrinking follicles finally stop producing hair.
Hamilton classification for Men :
For Men(Male Pattern Hair Loss-MPHL), permanent baldness generally follows a specific pattern which starts either in temporal areas(sides of head) or vortex( top of head). In general, those who begin losing hair in the second decade are those in whom the hair loss will be the most severe. In some men, initial male-pattern hair loss may be delayed until the late third to fourth decade. It is generally recognized that men in their 20’s have a 20 percent incidence of MPHL, in their 30’s a 30 percent incidence of MPHL, in their 40’s a 40 percent incidence of MPLH, etc. Using these numbers one can see that a male in his 90’s has a 90 percent chance of having some degree of MPHL.
Ludwig classification for women :
Female Pattern Hair Loss (FPHL) differs from Male Pattern Hair Loss (MPHL) in the following ways. It is more likely to be noticed later than in men, particularly at times of hormonal change, i.e., use of birth control pills, after childbirth, around the time of menopause, and after menopause. Recession at the temples is less likely than in men and women tend to maintain the position of their hairlines. Like in men, the entire top of the scalp is the area of risk. In women there is generally a diffuse thinning throughout the area as opposed to thinning in the crown of men. However, Women rarely experience total loss of hair in an area if the loss is due to FPHL. Androgens are responsible for hair loss in women by the same mechanisms they cause hair loss in men. Women do produce small amounts of androgens by way of the ovaries and adrenal glands. Also prehormones are produced by the ovaries that are converted to androgens outside of the ovaries or adrenal glands.
It is important to note that even, in the most extensive cases, a Horseshoe-Shaped fringe of hair remains in the back of the scalp. This hair-bearing fringe is insensitive to the balding process and usually will last a lifetime. Because hair is genetically programmed in the hair follicle, the hair in this area serves as the basis for hair transplantation. These hairs, when transplanted into thinning or balding areas, will take root and grow, and continue to grow for the rest of a person’s life