Many people who have problems with alcohol and other drugs may also experience mental health issues such as anxiety, depression or psychosis.
The term "dual diagnosis" is used when a person has both an alcohol or other drug problem and a mental illness. It is also known by a range of other terms, including "comorbidity", "comorbid disorders" and "concurrent disorders".
Research indicates that 29 per cent of people living with a mental health disorder have a coexisting substance use disorder, or comorbid condition (2007 National Survey of Mental Health and Wellbeing: Summary of Results).
Read more about drugs and mental health at the links below.