What theories exist for the causes of male hair loss ?

You should know that Egpytians were a mix of Bantu, Arabs and even a bit of Caucasian so its not surprising that their would have hairloss. Even African Americans suffer hair-loss due to mixtures with the European gene pool even if they are not Bantu of San

The San bushmen are an isolated and relatively pure ethnic group, and they are of special interest because they share the direct lineage from the direct descendants of all humans. They give us a window to what humans might have originally looked like 60000 years ago

The history for genetic hair loss and its causes has perplexed doctors and other scientists for generations; however, one doctor did come up with a solution which I outlined in a post some years ago after reading his book. Here is the post: https://baldingblog.com/2008/01/23/evolutionary-reason-for-hair-loss/