yes it is..........
I think biology plays a role too.
A precursor to underlying condition.
Depression is a mood disorder caused by an imbalance of certain chemicals in the brain. So yes, it is a mental disorder.
It's all temporary....
Yes, but that doesn't mean everyone who is 'depressed' has a mental condition. Some are just teenagers being really miserable and not really understanding the difference.
IDK, but I know it's serious.