Why Mental Illnesses and Addiction are Related
There is a high comorbidity rate between mental health disorders and addiction. However, it doesn’t mean that one condition necessarily led to the development of the other — even if one showed up first.
Instead, there are still various factors that should be considered, such as:
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Drug abuse can lead individuals to experience one or more symptoms or signs of another mental disorder. For instance, there's a higher risk of psychosis in people who use marijuana.¹²
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Mental health disorders can result in alcohol or drug abuse because some individuals use substances to self-medicate.¹³ For example, nicotine can sometimes reduce specific schizophrenia symptoms and may improve cognition.
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Evidence also shows that mental health disorders and addictions are caused by genetic influences, underlying brain deficits, and exposure to trauma earlier in life. For example, it's estimated that 40% to 60% of an individual's vulnerability to addiction can be due to genetics. A few human genome regions have also been associated with a higher mental illness and substance abuse risk.¹⁴
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Another common factor between addiction and mental health disorders is the individual's age when symptoms first appear. During the teenage years, individuals are still growing, maturing, and developing. Because of this, substantial brain changes occur during adolescence. For example, teens are more prone to act impulsively and take risks.
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Finally, emotionally or physically traumatized individuals are at a much greater risk of SUD. This connection is especially problematic for veterans coming back to the country.