I tend to believe that situational depression is more prevalent in those with BP than might often be believed. I do see on this board, at times, instances where I truly believe the depression is situational when it is attributed to BP.

I have completely agreed with my pdoc when she has said I've previously been in 'situational' depression because of my mother's cancer diagnosis and then problems with my relationship with my brother over her care and caring for her in and of itself (for her MS and cancer). It makes sense. That's what I believe.

I think the literature often says that BP depression tends to occur just after an episode of hypo/mania, that this is the cycle. This doesn't mean that it can't occur at other times; I have these questions in my head as well. I also don't think it's the longevity of depression that can mean it's due to BP: I believe a situational depression can turn into a prolonged depression, even after the original cause has dissipated or disappeared.

Great topic!