Obviously there is depression caused by events, that type is "easy" to fix because (usually) you can fix the external events, or at least talk about them and come to terms with them.

But there is also depression caused by nothing whatsoever. Nothing detectable anyway.

People tend not to believe it can be possible, until they experience it (personally or by talking to someone who is experiencing it).

Talking about it (therapy) does nothing, because there is nothing bad happening to talk about. The person is just depressed for no reason at all, it's like someone pressed a "be depressed" switch in their brain. The person is aware of it, wants it to stop, and has no control over it at all, and no ability to change it.

It's that type that they call "chemical imbalance". The chemical imbalance part is nonsense of course, but the existence of this type of depression is not.

> but I think its overused.

In TV commercials, yes, I agree. But in real life? No, I don't think it's overused.

I think its overused, because its exactly that type of depression they tried put on me.

When in reality I was lonely, didn't have much opportunity to socialise etc.

It was only fixed when I got out that situation, basically by chance by getting a introduction into an accepting social circle. I am now very happy.

The highest sucide rates are basically in young men, basically because how society treats them. I don't think its because young men are more prone to chemical imbalances, compared to women or older people. Its because its that stage in life, when men are literally lonely because of the transition from college to work and you can end up isolated and alone.