Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Post-Traumatic Stress Disorder ?
    ### Response:
    Post-traumatic stress disorder (PTSD) is a real illness. You can get PTSD after living through or seeing a traumatic event, such as war, a hurricane, sexual assault, physical abuse, or a bad accident. PTSD makes you feel stressed and afraid after the danger is over.
    