Nearly one in five U.S. adults (46.6 million) and nearly half of adolescents (ages 13 to 18) are living with mental illnesses. This group of conditions involve changes in mood, thinking and/or behavior, and can be associated with significant distress and problems functioning in everyday activities. Mental illnesses represent a wide spectrum of conditions including for example, depression, bipolar disorder, schizophrenia, substance use disorder, anxiety disorders, eating disorders, obsessive compulsive disorder and post-traumatic stress disorder as well as other lesser known conditions. Each of these illnesses often vary in degree of severity, ranging from mild to moderate to severe (substantially interfering with major life activities) and may also be co-occurring.