Psychology Today explains that people who meet the criteria for a dual diagnosis have both a mental health or mood disorder, such as depression, an anxiety disorder, or bipolar disorder, and an addictive disorder. The disorders are separate but related; the degree of overlap can be very complex, which requires the treatment to be similarly nuanced. A dual diagnosis is also known as co-occurring disorders. These terms generally describe the same condition, but there are debates over how accurate and encompassing they are in referring to those who have a mental health disorder while abusing chemical substances and/or engaging in harmfully compulsive behaviors.