Humans naturally lose hair every day – it’s just a part of a normal hair growth cycle. A few strands falling are not a cause of worry since new hair will grow to replace them. If the loss is more than just a few strands and new growth doesn’t seem to be keeping up, however, it might be a case of male or female pattern hair loss (MPHL or FPHL), a.k.a. Androgenetic alopecia.
Androgenetic alopecia, as the name implies, is rooted in genetics particularly those affecting the sex hormone androgen. The hormone is responsible for different functions, including the regulation of hair growth. In the case of MPHL, problems with the hormone cause hair follicles to shrink, resulting in shorter and finer strands, until hair eventually stops growing.