To me this seems suspiciously like confusing heightened awareness of a problem, or inability to treat it early, with cause.

People who seem likely to be diagnosed seem less likely to happily sleep for 12 hours a day for a few weeks after a viral infection, more likely to blame themselves for their state and more stressed by awareness that something is wrong.

Naturally, if a rich layabout has the problem anyway, then we can look to their childhood and find at least one trauma.