Addiction and mental health are deeply interconnected, with substance use disorders often co-occurring with mental health conditions such as anxiety, depression, and schizophrenia. Individuals struggling with addiction may experience changes in brain function that exacerbate psychiatric symptoms, creating a vicious cycle of worsening mental health and substance dependence. Research in this area focuses on understanding how substances like alcohol, drugs, and nicotine alter brain chemistry and structure, leading to compulsive behaviors and emotional dysregulation. Advances in treatment approaches include a combination of behavioral therapies, pharmacotherapy, and neurostimulation techniques aimed at restoring balance to brain function. Integrating mental health support with addiction treatment is crucial for effective rehabilitation, helping individuals address both the root causes and consequences of their condition to promote long-term recovery and mental well-being.