Mental Health & Addiction
Co-occurring Mental and Substance Use Disorders
The coexistence of both a mental health and a substance use disorder is referred to as co-occurring disorders.
According to SAMHSA’s 2014 National Survey on Drug Use and Health (NSDUH) (PDF | 3.4 MB), approximately 7.9 million adults had co-occurring disorders in 2014. During the past year, for those adults surveyed who experienced substance use disorders and any mental illness, rates were highest among adults ages 26 to 49 (42.7%). For adults with past-year serious mental illness and co-occurring substance use disorders, rates were highest among those ages 18 to 25 (35.3%) in 2014.