The most common cause of hair loss in men is androgenetic alopecia, also known as male pattern baldness or female pattern hair loss. It is caused by the effects of the male hormone dihydrotestosterone (DHT), the production of which starts at puberty [1-2].
DHT affects susceptible hair follicles on the top, front, and crown of the scalp. That’s why most men with male pattern baldness see a receding or uneven hairline or a bald spot on their crown. When DHT binds to androgen receptors in your hair follicles, it can cause them to stop producing hair.
As the cycle continues, the hair follicles become shorter resulting in thinner or finer hair. Eventually, follicles remain in the catagen phase and won’t return to the growth phase.
When you have a hair transplant, donor hair follicles are taken from the back and sides of the scalp and inserted into areas where there is thinning hair or balding. The transplanted hair follicles keep their genetic composition, meaning they stay immune to the effects of DHT.