When individuals personally experience or witness traumatic events, especially those that pose a threat to life, it can trigger intense fear and lead to severe, persistent stress symptoms such as anxiety and insomnia. For most people, these symptoms will subside in a short period, and not everyone who experiences trauma will develop Post-Traumatic Stress Disorder (PTSD). However, if these symptoms last for more than a month and affect daily functioning, a diagnosis of PTSD may be made.