There have been terms and overlap. Abandoning post. Cowardice. Desertion. When talking about war.

It's been around for awhile.

Evolutionary. If one were experiencing constant threats. Hypervigalence, decreased sleep. Sort of adaptive right? Harmful. But short term kept people alive.

So not modern.

There was a lot more drinking back in the day too so. Self medication of sorts. But the occurance and harm is not new. Just new that we recognize the constellation of symptoms and harm.

Edit think of taste aversion. Weve only come up with common terminology relatively recently. But our innate biological response to becoming food poisoned and subsequent avoidance/consequences of it have been around forever.