<prompt> A young male, victim of earthquake few months back, presented with complains of recurrent and intrusive recollection of the events and thoughts with anxiety causing disturbed routine life. The likely diagnosis isPost-traumatic stress disorderObsessive compulsive disorderParanoid schizophreniaDelusional disorder  <response>: Ans. a Post-traumatic stress disorder. Ref. Psychiatry by Niraj Ahuja, 5th ed., 115, 188ACUTE STRESS DISORDER POST TRAUMATIC STRESS DISORDERThese disorders are characterized by Severe Anxiety symptoms follow a threatening event that caused feelings of Fear, Helplessness or Horror. Acute Stress Disorder: Anxiety lasts 1 month but 2 days Post Traumatic Stress Disorder PTSD: Anxiety lasts 1 month May occur at any age 50 of cases resolve within 3 months symptoms begin immediately after trauma, but may occur after months years Re-experiencing of the Traumatic Event- Dreams, Flashbacks or Intrusive Recollections- Avoidance of Stimuli associated with the trauma or numbing of general responsiveness- Increased Arousal: Anxiety, Sleep disturbances Hypervigilance Survivor guilt - A feeling of irrational guilt about an event sometimes occurs. Rx: Counseling after a stressful situation to prevent PTSD from developing. Group Psychotherapy with other survivors is helpful. Pharmacotherapy: ntidepressants SSRI, TCAs or Benzodiazepines 