Quote ="Shaggoth"What I've always found bizarre is the number of people from comedic backgrounds that suffer. Stephen Fry, Frankie Howard, Spike Milligan to name a few. '"
I think it's probably the other way round. I'd bet a lot of comedians, if not bipolar, tend to a depressive personality and use comedy, consciously or unconsciously as a defensive mechanism.
I can also easily understand how it may make matters worse, I've read often about the high of being on stage in front of an adoring audience and then the problem of trying to get down from the high, and I should imagine for a person with a tendency to depression this could get seriously bad, the memory of the temporary "fix" only making things worse.
The psychotherapist/comedienne Dr. Amy Alpine suggested in an article some time back that both depression and Bipolar disorder are common among comedians, and interestingly said that some comedians who were bipolar didn't want to be treated because they didn't want their "manic" episodes to go away.
Quote You could see the fuel behind the fire of comedians such as Jonathon Winters, Ben Stiller, and Robin Williams who all reportedly have this disorder.'"
I don't think it's just comedians though but more people who are extroverts, performers in general (Paul Gascoigne, anyone?) In 2007 actor and funny man Owen Wilson attempted suicide by slitting his wrists. Jim Carrey's life has reportedly been a story of battles with depression. Well known depressives that I know of include Woody Allen, Rodney Dangerfield, Rosie O'Donnell, Ruby Wax, Caroline Aherne, Catherine Tate, Paul Merton, Bill Oddy, Sarah Silverman, Russell Brand and Stephen Fry. Manic laughter and manic depression seem to be close relatives.
Mind you the problem of depression and mental illness in general is endemic to the human population and it's a pity, despite how widespread mental issues are, that there is still a stigma attached and people prefer to joke and put down. My dear old mum sadly had serious episodes of manic depression that we had to deal with and so I have more experience of it than I'd like, and it's probably why I've been a supporter of MIND for a long time. But I do think that attitudes have definitely appreciably changed for the better, even if there is a very long way to go.