I separate depression into two very different types. (You can argue more)
Situational depression which is very understandable and normal to the situation. A parent/sibling/spouse/child/friend/loved one dies. You lose a job. Divorce. Something that you were very much looking forward to fails to happen. Finances to go hell in a handbasket. An acute situation that sucks, but life does go on and we do adapt.
Clinical depression which is much more complex in understanding it. Is there a root cause? Is it a imbalance of brain chemistry? A brain injury? This is still real, but less well understood.
I would include health issues and accidents in your first grouping.
I like your analysis and it fits pretty good.
Most people at some point have had a situation depression that could have lasted weeks or months.
Well said. And there’s no use arguing because even the self-appointed experts keep shifting their conclusions. And their terms and sub-categories.
As the immortal bluesman Chester Arthur Burnett (Howlin’ Wolf) said: When you feel down, you feel depressed, what you have is the blues.