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When these symptoms last after the drugs wear off, then it can indicate a co-occurring mental health disorder. Chronic drug and alcohol abuse increases the chances of becoming a victim of assault or rape. These traumatic events can create serious mental health issues like PTSD, depression, eating disorders and more.
Mental illnesses can increase the risk for alcoholism or drug abuse, sometimes because of self-medicating. On the other hand, alcoholism can lead to significant anxiety and depression that may appear indistinguishable from a mental illness. There is also evidence that addiction and mental disorders are associated with the dysfunction of a group of brain chemicals called monoamine oxidases. 2  Shared environment. 3  Studies surrounding twins also showed that environment plays a major role in having both a substance abuse problem and another mental disorder.