The document reviews the connection between comorbidity (the coexistence of two or more disorders) and substance abuse, emphasizing that individuals with substance use disorders often develop other mental health issues, such as anxiety and depression. It explores the psychological and genetic factors contributing to this link and discusses the challenges in treating patients with comorbid substance abuse and mental health disorders, including the need for integrated treatment approaches. Various effective medications and behavioral therapies are highlighted to address both addiction and mental illness simultaneously.