There is no single profile of the “lone wolf terrorist,” but research suggests that several characteristics are common. These include vocational problems, high stress levels, problems with intimate partner relationships, social awkwardness, violent communication, high intelligence, and a mental illness. Many lone actors have had difficulties functioning adequately in everyday life and maintaining healthy relationships. However, not all group members have every characteristic, such as mental illness. (Only a small minority of people with mental illnesses are violent.)