This chapter explains early warning signs, which are mild symptoms that occur before another episode of illness, or a relapse. To help prevent a relapse, young people can stick with treatment, watch for early warning signs, and work with their mental health professional to intervene promptly. Young people can identify their unique warning signs by thinking back to the time just before the first episode to identify the two or three early warning signs that they should watch for. Family, friends, and mental health professionals can help identify the changes they observed as well. Open communication between the young person and his or her family, friends, and mental health professionals is important when early warning signs start to occur. By carefully monitoring early warning signs, young people, their families, and their mental health professionals can work together to help lessen the severity of any future episode of psychosis that a person may have—or prevent a relapse altogether.