I hesitate to write this, but PTSD is a bit more complex than that.
In some cases there's damage to the hippocampus, which doesn't get better. I've had 40 years to make peace with the crappy accident I was in. But the things like an exaggerated startle reflex, an aversion to chaotic or unplanned sounds and other triggers remain. I always carry a pair of noise-cancelling headphones if I think I might need to be in a noisy environment.
In some cases there's damage to the hippocampus, which doesn't get better. I've had 40 years to make peace with the crappy accident I was in. But the things like an exaggerated startle reflex, an aversion to chaotic or unplanned sounds and other triggers remain. I always carry a pair of noise-cancelling headphones if I think I might need to be in a noisy environment.