What Does It Mean If Someone Has Co-Occurring Disorders?

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Answer the following questions in paragraph format (at the end of the questions or as an attachment), using at least one credible source. (not including our book).
1. What does it mean if someone has “co-occurring disorders”?
2. When someone has both a mental health and a substance use disorder, is it always clear which disorder came first?
3. Why do people with co-occurring disorders need personalized treatment?