Post-traumatic stress disorder (PTSD) is a delayed onset and long lasting psychiatric disorder due to an unusually threatening, catastrophic psychological trauma. Such events include war, serious accidents, earthquakes, rape, torture, etc. Almost all people who experience such events feel great distress, often causing the individual extreme fear, dread, and a sense of helplessness. The severity of the event itself is a prerequisite for the development of PTSD. In our everyday language, many unexpected events can be described as “traumatic,” such as divorce, job loss, or exam failure. However, studies have found that only about 0.4% of events have a “traumatic” meaning. Recent research suggests that so-called “traumatic experiences” should have two characteristics: First, they have a traumatic effect on future emotional experiences. For example, the rape victim may experience similar experiences repeatedly in her future marital or sexual life; secondly, it is extremely harmful or threatening to her body or life. Of course, individual personality traits, personal experiences, social support, and level of somatic health are also influential factors in the condition and course of the disease.