Post-Traumatic Stress Disorder, commonly known as PTSD, is a mental illness triggered by one or more terrifying events that happened in the past, either being experienced or witnessed. The events include severe injury, extreme violence, sexual assault, or warfare, etc. The symptoms of such mental disorder caused by the past traumas include disturbing flashbacks, severe anxiety, and hyperarousal, which results in a constant condition of being easily startled and feeling tense for a long period of time. People diagnosed with PTSD suffer from the disorder for more than several weeks; those who do suffer from the disorder but recover within a short period of time are diagnosed with Acute Stress Disorder, also known as ASD. Researches have shown
