Attention–deficit/hyperactivity disorder (ADHD) is commonly comorbid with bipolar disorder, however, because the two disorders share some common symptoms, differential diagnosis is important.1-3 People with bipolar disorder can experience periods of increased activity, poor concentration, and impulsivity, but these periods are typically episodic, rather than chronic as in ADHD.1 Additionally, whilst bipolar disorder in very young children is rare, ADHD is more common.1
References:
1. American Psychiatric Association (APA). Diagnostic and Statistical Manual of Mental Disorders. Fifth edition, text revision. Washington DC: APA; 2022.
2. Schiweck C, Arteaga-Henriquez G, Aichholzer M, et al. Comorbidity of ADHD and adult bipolar disorder: a systematic review and meta-analysis. Neurosci Biobehav Rev 2021; 124: 100–123.
3. Salvi V, Ribuoli E, Servasi M, et al. ADHD and bipolar disorder in adulthood: clinical and treatment implications. Medicina (Kaunas) 2021; 57 (5): 466.