WATCH: Frightening Footage of WWI Shell Shock Victim

During and after WWI, millions of soldiers suffered psychological trauma as a result of their horrific war experiences.

Some of the symptoms they faced ranged from anxiety, diarrhea, loss of control over voluntary movements, including standing or walking, and hysterical tics.

The cases of mental distress were largely due to shells bursting near soldiers at close range, being buried alive or exposed to heavy fire.

Initially called shell shock, the medical community later began calling it “war neuroses” instead. This neuroses was responsible for one-third of all discharges.

In the video above, you’ll see a soldier staggering around a barren room — unable to control his own body from thrashing around. While the footage may appear disturbing, after a series of treatments, he did end up recovering.