Substance-induced mood disorders occur when the use of drugs or alcohol leads to the development of mood disturbances, including depression, anxiety, and mania. These disorders can either mimic or exacerbate underlying mental health conditions, complicating diagnosis and treatment. Substance-induced mood disorders are a common feature of addiction, where the effects of the substance cause significant changes in brain chemistry, particularly in areas that regulate mood and emotional responses. Management often involves addressing both the addiction and mood disorder simultaneously, with a combination of pharmacotherapy and psychotherapy to stabilize mood and prevent relapse.