Post-Traumatic Stress Disorder (PTSD) is a condition that people who have endured a traumatic event such as war, a violent crime, or abuse sometimes deal with. PTSD includes symptoms such as nightmares, irrational fears, flashbacks, anxiety, and insomnia. It affects about 7.7 million American adults and it can affect children, too.

Preliminary research suggests that PTSD patients may benefit from virtual reality psychotherapy. The virtual reality helps patients relive some of their traumatic experiences while in a safe environment. Iraq war veterans took part in the study -- taking medication and using the virtual reality treatments -- and it's helped many of them confront their fears.