Actually we're getting increasing evidence that there are two different disorders/diseases here.
1. is the low grade TBI(traumatic brain injury) that is fairly called "Shell shock"
2. is the psychological weight of traumatic experiences
The evidence is pretty strong that part of why soldiers PTSD is so hard to treat(not that PTSD is easy to treat in general) is that their neurons have been damaged so it's literally more difficult for them to learn new stress responses and make use of CBT(Cognitive Behavioral Therapy) to manage their inappropriate, for civilian life, stress responses.
1. is the low grade TBI(traumatic brain injury) that is fairly called "Shell shock" 2. is the psychological weight of traumatic experiences
The evidence is pretty strong that part of why soldiers PTSD is so hard to treat(not that PTSD is easy to treat in general) is that their neurons have been damaged so it's literally more difficult for them to learn new stress responses and make use of CBT(Cognitive Behavioral Therapy) to manage their inappropriate, for civilian life, stress responses.