Post-Traumatic Stress Disorder (PTSD)
PTSD (post-traumatic stress disorder) is a change in the brain which means we struggle to process traumatic events. It can affect memory, concentration, sleep, social interactions all of which could impact someone in the workplace. PTSD is a treatable condition.
Talk to them. People worry about saying the wrong thing but it’s better to talk to the person than to avoid it. It’s better to say the wrong thing than nothing at all!