Androgenetic alopecia (male pattern baldness) is the most common form of hair loss, accounting for 95% of male hair loss cases.
While there are many possible reasons why someone may show hair loss, such as chronic diseases, skin diseases, reactions to certain medicines, seasonality, stress, malnutrition, environmental pollution and other aspects of modern life, the greatest percentage of male hair loss is due to heredity.
The estimated rate of inheritance of male hair loss is 81%. This means that genetic factors contribute more to the risk of male baldness than environmental factors. Hereditary predisposition is the most powerful factor for hair loss in men; the genes largely determine whether a man will show male pattern hair loss, the age of its onset, the pattern and the degree of progress.
Today, it is possible to determine the probability of a young man to display androgenetic alopecia with specific genetic tests, which reveal the presence of genes in the individual’s DNA that are associated with male pattern baldness.
Patterns of Male Hair Loss
The most common pattern of androgenetic alopecia is the frontal and temporal thinning, with a tendency to extend to the crown of the head. Over the years, the thin area on the crown of the head expands and in many cases ultimately unites with the front area. Hair loss with apparent thinning occurs in 25% of the male population by the age of 30 and in 50% by the age of 45-50.
There is strong evidence that the pattern and the development speed of alopecia in each man has a hereditary background. The stages of progression of hair loss in men is reflected in the Hamilton-Norwood scale for androgenetic alopecia.