While the symptoms of PTSD can vary greatly, some of the most common symptoms include:

• Intrusive memories, including reliving the trauma through nightmares or flashbacks
• Changes in physical and emotional reactions, including being easily frightened, feeling anxious or hypervigilant, difficulty sleeping, trouble concentrating, irritability or aggressive behavior, feelings of guilt or shame, and self-destructive behavior like drinking too much. 
• Negative changes in thinking and mood, including negative thoughts about yourself, hopelessness about the future, feeling detached from family and friends, and difficulty experiencing positive emotions.
• Avoiding situations, including places, people, and activities that may that remind you of the traumatic event