Traumatic Stress Syndrome is a psycological disorder that causes irrational behavior and reckless behavior.
In an alternate timeline, The Doctor diagnosed Captain Janeway with it while they were passing through Krenim territory in 2374. He did this after treating Janeway for third degree burns as a result of her delibrately entering Deflector Control while a fire raged inside to reactivate the main deflector array while USS Voyager was being bombarded by small meteorites. He classified this as reckless behavior and threatened to relieve her of duty if she did not allow the Doctor to monitor her. Janeway refused, and was thus relieved of command. However, Janeway denied this order, which the Doctor classifed as yet another symptom of Traumatic Stress Syndrome. In the end, Janeway returned to duty after the Doctor said that she would be a candidate for a court martial. (VOY: "Year of Hell, Part II")