People with PTSD experience a range of symptoms, from flashbacks and avoidance to angry outbursts, distorted feelings, and loss of interest or memory. Symptoms can be chronic or triggered by memories, sounds, people, or anything related or similar to the initial trauma.
If you have a friend or family member who is experiencing abuse here are some things you can do to help. The most important thing to remember is that the choice to leave or not is theirs. You can't make them leave a bad situation but you can be supportive and helpful in their choice. They will need someone they can count on when/if they do decide to end or leave the abusive relationship.