manhhai, CC BY
“In the wake of World War I, some veterans returned wounded, but not with obvious physical injuries. Instead, their symptoms were similar to those that had previously been associated with hysterical women – most commonly amnesia, or some kind of paralysis or inability to communicate with no clear physical cause.
“English physician Charles Myers, who wrote the first paper on “shell-shock” in 1915, theorized that these symptoms actually did stem from a physical injury. He posited that repetitive exposure to concussive blasts caused brain trauma that resulted in this strange grouping of symptoms. But once put to the test, his hypothesis didn’t hold up. There were plenty of veterans who had not been exposed to the concussive blasts of trench warfare, for example, who were still experiencing the symptoms of shell-shock. (And certainly not all veterans who had seen this kind of battle returned with symptoms.)
“We now know that what these combat veterans were facing was likely what today we call post-traumatic stress disorder, or PTSD.”