Post-traumatic stress disorder (PTSD), sometimes known as shell shock or combat stress, occurs after you experience severe trauma or a life-threatening event. It's normal for your mind and body to be in shock after such an event, but this normal response becomes PTSD when your nervous system gets “stuck.”

How does war affect PTSD?

People often experience trauma during war. Over time, this can develop into a condition we now recognise as post-traumatic stress disorder (PTSD). Sufferers can experience severe anxiety, flashbacks, nightmares, insomnia and anger, amongst other symptoms.

What war had the worst PTSD?

World War One and Vietnam are the wars most closely associated with post-traumatic stress - but it was also a huge problem for the combatants in World War Two, and one that may still be affecting their children and grandchildren today.