Selfharm is a coping method or attention seeking method explain

Yes. Because the physical is easier to deal with them the mental/emotional pain so if you can manifest it into physical it helps take the edge off. Cutting I always thought was more attention seeking because it leaves marks that can be seen by others. But there are other ways to self harm that aren't so obvious.

considering that a majority of injuries are kept hidden, I would say mostly a coping mechanism.

The endorphins released help soothe.... but, of course, it's temporary and long term badness ensues...

Both depending on the person.

Coping mechanism

It's a release

Either way, the person is going through something mentally that needs addressed. Healthy people don't do either of these.

It is whatever it is to the person doing it. There’s no generalisation with it

I dont think it needs to be explained