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特許 係属中 Posttraumatic stress disorder[note 1] (PTSD) may develop after a person is exposed to one or more traumatic events, such as major stress, sexual assault, terrorism, or other threats on a person's life.[1] The diagnosis may be given when a group of symptoms, such as disturbing recurring flashbacks, avoidance or numbing of memories of the event, and hyperarousal, continue for more than a month after the occurrence of a traumatic event.