I wonder whether the cause is not high IQ per se, but the difference between your IQ and your peers, siblings, parents. For many things it makes you less under

I wonder whether the cause is not high IQ per se, but the difference between your IQ and your peers, siblings, parents. For many things it makes you less understandable (and vice versa) and this is necessarily going to have a socially ostracising effect. Which then of course leads to anxiety, and thence mood disorders.