PTSD is a mental health condition which can have both psychological and physical effects. It is usually triggered by a perceived life threatening, traumatic, distressing or terrifying event. Individuals who have experienced or witnessed traumatic events can suffer with PTSD. Characteristics of PTSD include reliving of the traumatic event (flashbacks), sleep disturbance, isolation and detachment. Severe PTSD can have a debilitating effect on an individual and can affect their relationships and day to day living.