Shell shock is not quite the same as PTSD; it is a separate disease. Shell shock is a neurological affliction cause by constant exposure to artillery fire. Shell shock physically damages the body. This is you see people shake and convulse like crazy, their brain and nerves are damaged. In fact, once removed from the front lines, [many victims of shell shock got better with treatment](https://www.youtube.com/watch?v=IWHbF5jGJY0); their bodies repaired themselves.
PTSD is a psychological illness. In this case, a person’s body is not physically damaged to the same extent as a person with shell shock.
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