Hair loss usually develops
very gradually, typically starting with the appearance
of a bald spot in the crown of the scalp and thinning of
the temples.
Although it can begin at
any time, often men first become aware of it as they
approach their 30s.
The condition runs in the
family, the strongest influence coming from the mother's
side.
This means that if a man's
mother's father is bald, the chances are he will also
eventually lose his hair.