the two most widely experienced Trauma and Stressor-Related Disorders are Acute Stress Disorder (ASD) and Post-Traumatic Stress Disorder. Either/both may consist of intrusive thoughts, dreams, or “flashbacks” related to a traumatic, dangerous, or stressful event. Acute Stress Disorder develops right after the event and lasts for days, whereas PTSD may have delayed development and last for months or years.

Learn more about PTSD https://www.nimh.nih.gov/health/topics/post-traumatic-stress-disorder-ptsd