Interpersonal Psychotherapy for Posttraumatic Stress Disorder

particular sensory and psychological triggers that may provoke symptoms.
There are many other ways to divide the diagnosis. Military cases of PTSD 
appear harder to treat (although again, they are not untreatable), perhaps be-
cause of both the severity of the traumatic experience and the difficulty vet-
erans face in readapting and re- assimilating to civilian society upon their 
return from the front. 
DSM-5
 distinguishes between subtypes of PTSD: a pre-
school classification, for children less than six years old; and a dissociative 
subtype, for patients who feel detached and depersonalized, and with delayed 
expression (Table 2. 1).