Acute stress disorder (ASD) is a mental disorder that can occur in the first month following a trauma. The symptoms that define ASD overlap with those for PTSD. One difference, though, is that a PTSD diagnosis cannot be given until symptoms have lasted for one month. Also, compared to PTSD, ASD is more likely to involve feelings such as not knowing where you are, or feeling as if you are outside of your body.
How common is ASD?
Studies of ASD vary in terms of the tools used and the rates of ASD found. Overall, within one month of a trauma, survivors show rates of ASD ranging from 6% to 33%. Rates differ for different types of trauma. For example, survivors of accidents or disasters such as typhoons show lower rates of ASD. Survivors of violence such as robbery, assaults, and mass shootings show rates at the higher end of that range.