Concurrent disorders is a term that describes the involvement of mental illness and substance abuse in a patient. For example, an individual with an anxiety disorder who drinks alcohol excessively to cope, has a concurrent disorder. Concurrent disorders may also be known as dual disorders, dual diagnosis, or co-occurring disorders. Although concurrent disorders are often related, both of the disorders may not be active at the same time. In most cases, concurrent disorders impact each other. Individuals with concurrent disorders often are most successful when both disorders are addressed and treated at the same time. Mental illness and substance abuse go hand-in-hand in most cases: people with a mental illness have higher rates of developing substance abuse issues; people with substance abuse issues have higher rates of having an existing mental illness.