Post-traumatic stress disorder (PTSD) is a mental health disorder that occurs after a person experiences a traumatic or life-altering event. Many people experience feelings of fear and anxiety after dealing with a traumatic life event. As time goes on, most people will find healing from their trauma naturally. However, those who develop PTSD after trauma may find that their fears and anxieties associated with their trauma will begin to negatively impact their ability to live their life. They may find themselves feeling afraid and anxious a large amount of the time, whether they know why or not.