This disorder is typically brought on by a traumatic event.
The primary symptoms are memory gaps related to traumatic or stressful events which are too extreme to be accounted for by normal forgetting.
Memory typically returns (and therefore the disorder dissipates) with time. Therapy can be useful to help with coping skills, but is not always needed unless the individual develops excessive fears or worries, or the memory loss has a drastic effect on their everyday functioning.
Prognosis is extremely good.