The Canadian ‘Centre for Addictions and Mental Health’ (CAMH) provide an excellent definition of ‘concurrent disorders’(CAMH.ca):
Concurrent disorders is a term for any combination of mental health and substance use problems. There is no one symptom or group of symptoms that is common to all combinations.
The combinations of concurrent disorders can be divided into five main groups:
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substance use + mood and anxiety disorders, such as depression or panic disorder
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substance use + severe and persistent mental health disorders, such as schizophrenia or bipolar disorder
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substance use + personality disorders, such as borderline personality disorder, or problems related to anger, impulsivity or aggression
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substance use + eating disorders, such as anorexia nervosa or bulimia.
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other substance use + mental health disorders, such as gambling and sexual disorders.
To understand and treat a particular combination, we need to look at the specific issues to see:
How does each problem affect the other one?
Mental health and substance use can affect each other in several ways:
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Substance use can make mental health worse.
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Substance use can mimic or hide the symptoms of mental health disorders or issues.
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Sometimes people turn to substance use to “relieve” or forget about the symptoms of negative mental health.
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Some substances can make mental health medications less effective.
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Using substances can make people forget to take their medications. If this happens, the mental health issues may come back (“relapse”) or get worse.
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When a person relapses in one area, it can trigger the symptoms of the other area.
A person with concurrent disorders will often have more serious medical, social and emotional concerns than if they had only one condition. Treatment may take longer and be more challenging.