Bipolar Disorder and Attention-Deficit/Hyperactivity Disorder (ADHD): Importance and Differential Diagnosis

This chapter reviews the clinical importance and differential diagnosis between bipolar disorder and attention-deficit/hyperactive disorder (ADHD), highlighting the frequent overlap in symptomatology that complicates accurate diagnosis. It provides a comparative overview of diagnostic criteria and typical clinical features of each disorder, addressing their prevalence and comorbidity across different age groups, particularly in children, adolescents, and adults. Key points for differential diagnosis are presented, with particular emphasis on characterizing the qualitative and quantitative difference in symptoms such as mood instability, impulsivity, and behavioral problems. The review details assessment strategies essential for distinguishing between the two conditions, along with current evidence-based approaches for treatment and management when comorbidity exists. Finally, clinical implications for both integrated assessment and therapeutic planning are discussed, offering practical guidance that can aid clinicians in making precise diagnoses and implementing optimal interventions in complex clinical cases.