Nope, not preventable...especially in my case. It surfaced when it did and opened pandora's box. I had PTSD from the moment of the first memory. Could I have made it less severe...oh probably, I could have eaten better, slept better, taken care of myself better, etc...but I think you either have it or you don't and I think it starts from the moment of the trauma. Doesn't leave much room for someone to intervene.