Somatization disorder and post-traumatic stress disorder (PTSD) first appeared as diagnostic categories in the DSM-III. Although both concepts have long histories, their validity has been rather controversial. Somatization disorder overlaps with conversion disorder in terms of concept, and it can be difficult to make a differential diagnosis between these two. According to Patient Report in Japan in 2008, the ratio of diagnosis of “F45.8 Other somatoform disorders” and “F45.9 Somatoform disorder, unspecified” totaled 50% among F45 Somatoform disorder.

We present 3 cases of PTSD, which together illustrate that insufficient or the absence of predisposing factor leads to the level of acute stress reaction disorder, and presence of predisposing and precipitating factors constitutes PTSD, or “war-time neurosis”.