Post Traumatic Stress Disorder, or PTSD for short, is a type of anxiety disorder caused by a singular (or series of) traumatic events. The sufferer often relives these events through nightmares and flashbacks, which can lead to the sufferer feeling isolated and tormented.
Although military combat is the main traumatic event associated with PTSD, there are a number of other situations that can cause it. These include serious accidents; physical or sexual abuse or assault; being held hostage; witnessing violence or abuse; or experiencing a natural disaster. The symptoms can come about straight after the event, or quietly fester and traumatise its victim several years later.