PTSD occurs in people who have experienced a traumatic event. That includes events such as war, sexual assault, natural disasters, terrorist acts, serious accidents, and witnessing something terrible. However, that is not a complete list. PTSD can affect anyone at any stage of their life. Symptoms may include flashbacks, nightmares, sadness, fear, anger, detachment, aversion, irritability, mood swings, and strong emotional reactions. It can be treated effectively with professional assistance.