Answer:
The co-occurrence of different disorders, whereby individuals who have one mental disorder also suffer from another, is identified by the DSM as 'dual diagnosis' or 'co-occurring disorders'
Step-by-step explanation:
The 'Diagnostic and Statistical Manual of Mental Disorders' (DSM) describes the existence of two different disorders in an individual as 'co-occurring'. These can be two mental disorders happening in the same person or, more commonly, a combination of a mental disorder and a subtance use disorder, such as alcohol or drugs. Individuals who have a combination of disorders face more challenges and generally need longer treatments than those who only have one disorder.