I enjoyed derailing this thread.
Well-documented cases:Schumann (psychosis, attempted suicide, hospitalized)Schubert (depression due to Syphilis, likely alcoholism, not hospitalized)Bruckner (obsessive-compulsive disorder, obsessed with counting everything he saw or thought or heard, hospitalized)Rachmaninoff, extended bout of depression (underwent psychoanalytic treatment)Donizetti (psychosis due to syphilis, hospitalized)Mahler (consulted Freud for sexual erectile dysfunction)Hugo Wolf (psychosis, due to syphilis, hospitalized; went around the streets of Vienna proclaiming: "I am Mahler!" "I am Mahler"!)Mussorsky (alcoholism)Ravel (brain malfunction)Probable: Tschaikovsky, extended bouts of depression, possible suicideChopin, generalized anxiety disorder?Wagner, narcissitic personality disorder?Of interest: Dozens of writers and poets committed suicide. To my knowledge very few if any of the better known composers. Why would that be?
Interestingly, almost all of the below were Romantics. As Nietszsche would have said, Romanticism was a malady in itself ...
Well-documented cases:...Ravel (brain malfunction)
I think the title of this thread should simply be renamed "Composers".