In 1919, President Wilson proclaimed November 11th as the first observance of Armistice Day, the day World War I ended. At that time, some symptoms of present-day PTSD were known as "shell shock" because they were seen as a reaction to the explosion of artillery shells.

When did they start calling shell shock PTSD?

Post-traumatic stress disorder was a major military problem during World War I, though it was known at the time as “shell shock.” The term itself first appeared in the medical journal The Lancet in Feb. 1915, some six months after the “Great War” began.

What was PTSD called before 1980?

It has been called shell shock, battle fatigue, soldier's heart and, most recently, post-traumatic stress disorder, or PTSD. Now, military officers and psychiatrists are embroiled in a heated debate over whether to change the name of a condition as old as combat. The potential new moniker: post-traumatic stress injury.