We inherit through our DNA not only our physical attributes, but also some internal and emotional sensitivities that can be carried through to future generations and can lead to premature hair loss.
For example, a worrying or over ambitious personality is usually accompanied by higher stress levels. The feelings of worry, stress or over-determination, can also cause hormonal changes. When excessive and prolonged, these character traits can also be carried through to future generations. Along with these traits, the consequences of hormonal changes are also passed on, and eventually can lead to premature hair loss, the most common example of this is the case of male baldness which is passed on to the next generation.