Co-occurring illnesses with bipolar disorder, such as alcohol and drug abuse, are very common. Research suggests that many factors contribute to these substance use issues, including self-medication for bipolar symptoms, mood fluctuations brought on or worsened by substance abuse, and overlapping risk factors that predispose individuals to both conditions. Addressing co-occurring illnesses with bipolar disorder is crucial, as incorporating treatment for substance abuse into the overall care plan can lead to improved outcomes and better management of both disorders.