1) The document discusses the diagnostic criteria for acute stress disorder which can develop after exposure to a traumatic or stressful event. 2) The criteria include experiencing intense fear, helplessness or horror during the event, having dissociative symptoms like numbness or reduced awareness after the event, and persistently reexperiencing the trauma through thoughts, dreams or flashbacks. 3) The individual must also experience anxiety, arousal or avoidance symptoms that last at least 2 days but less than 4 weeks and cause significant impairment.