" seems to be a normal reaction to worsening life conditions and not merely a brain chemicals imbalance" Just to make a distinction here. Worsening life condit

" seems to be a normal reaction to worsening life conditions and not merely a brain chemicals imbalance" Just to make a distinction here. Worsening life conditions will also cause a "chemical imbalance" so it would look the same. The problem with people who have a Mental Illness is that the mood changes appear without any "known" life changes, which makes it harder to find the cause. For me it is diet and environment that seem to have caused most of my issues. Depression is a symptom, always, since it is caused by something more fundamental.