Curious. I remember my counselor asking me if I was highly sensitive. I didn't know what he meant until now, from reading this
webpage. Dr Aron identifies a "sensitivity" trait, once mislabeled as shyness or introversion. She calls it Highly Sensitive Person (HSP).

click link to do the Highly Sensitive Person * SELF-TEST *

I wonder if HSP traits can account for certain PTSD criteria. For instance, certain HSP traits are similar to these PTSD diagnostic criteria: exaggerated startle response, avoidance of stimuli, detachment from others, and distressing external exposures. I'm not saying that HSP traits meet the PTSD criterions but there are similarities.

I also wonder if HSP are more susceptible to PTSD.