ADHD vs. Bipolar Disorder in Adults
ADHD and bipolar disorder share impulsivity, emotional dysregulation, and difficulty with sustained focus. They are also frequently misdiagnosed as one another — with significant consequences.
Joseph S. Volpe, Ph.D., Clinical Psychologist
Of all the conditions that overlap with ADHD, bipolar disorder may be the most consequential to confuse. The two conditions share a striking number of features — impulsivity, emotional dysregulation, distractibility, and periods of high energy followed by crashes. They are misdiagnosed as one another with troubling frequency. And the treatment implications could not be more different.
Understanding the distinction is not just clinically important. For the person living with one or both conditions, it can be the difference between years of ineffective treatment and finally getting the right help.
Where the Overlap Comes From
Both ADHD and bipolar disorder can produce:
- Impulsive decision-making and risk-taking behavior
- Difficulty sustaining attention and completing tasks
- Emotional reactivity and irritability
- Racing thoughts
- Reduced need for sleep during high-energy periods
- Periods of high productivity followed by crashes
- Relationship difficulties driven by mood and behavior
When a clinician sees these symptoms without a thorough history, the picture is genuinely ambiguous. This is why both conditions are frequently missed or misidentified — particularly in adults who have been managing symptoms for years without a clear explanation.
The Key Differences
The Nature of Mood Episodes
This is the most important distinction.
Bipolar disorder is characterized by discrete mood episodes — periods of mania or hypomania (elevated, expansive, or irritable mood with increased energy) alternating with periods of depression. These episodes have a beginning and an end. They last days to weeks. They represent a clear departure from the person's baseline functioning.
ADHD does not involve mood episodes in this sense. The symptoms are chronic and relatively stable — present across situations and across time, not cycling in and out. Emotional dysregulation in ADHD tends to be reactive (triggered by specific situations) rather than episodic (arising from internal mood shifts).
Ask yourself: are your mood changes tied to what is happening around you, or do they seem to arise from within, independent of circumstances?
The Timeline of Symptoms
ADHD is a neurodevelopmental condition. Its symptoms are present from childhood — even if they were not recognized or diagnosed until adulthood. If you look back at your early years, the patterns were there: difficulty in school, trouble sitting still, forgetfulness, impulsivity.
Bipolar disorder typically emerges in late adolescence or early adulthood. A first manic or hypomanic episode before age 12 is rare. If your difficulties began in childhood and have been continuous since, that history points more toward ADHD.
Hyperfocus vs. Hypomania
One of the most commonly confused features is the high-energy, highly productive state that both conditions can produce.
In ADHD, this is hyperfocus — an intense, sustained engagement with a topic or task that is interesting or stimulating. It is not accompanied by a reduced need for sleep, grandiosity, or the full constellation of hypomanic symptoms. It can be turned off (with effort) and does not represent a departure from the person's baseline.
In bipolar disorder, hypomania involves elevated or irritable mood, decreased need for sleep, increased goal-directed activity, and often a sense of unusual capability or importance. It is a distinct state — not just being very engaged with something.
Response to Stimulant Medication
This is not a diagnostic criterion, but it is clinically informative. Stimulant medications used to treat ADHD can, in some individuals with bipolar disorder, trigger or worsen manic episodes. If stimulants have produced significant mood elevation or instability in the past, that history is worth discussing with a clinician.
When Both Are Present
ADHD and bipolar disorder co-occur at higher rates than chance would predict. Research suggests that somewhere between 10 and 20 percent of adults with bipolar disorder also have ADHD. When both are present, the clinical picture is more complex — and treatment requires careful sequencing, typically stabilizing mood before addressing ADHD symptoms.
This is precisely why a thorough evaluation matters. Missing one diagnosis while treating the other produces incomplete results at best and harm at worst.
Getting an Accurate Answer
Distinguishing ADHD from bipolar disorder — or identifying both — requires a comprehensive evaluation that takes your full history seriously. It is not something a brief questionnaire or a telehealth intake can reliably accomplish.
If you have been told you have one of these conditions but the treatment has never fully fit, or if you have always suspected something was being missed, a thorough evaluation can provide clarity.
Learn more about the adult ADHD evaluation process at the Institute for Adult ADHD. Sessions are available via telehealth throughout Long Island and New York State.
References & Sources
American Psychiatric Association. (2022). Diagnostic and statistical manual of mental disorders (5th ed., text rev.). https://doi.org/10.1176/appi.books.9780890425787
Nierenberg, A. A., Miyahara, S., Spencer, T., Wisniewski, S. R., Otto, M. W., Simon, N., Pollack, M. H., Ostacher, M. J., Yan, L., Siegel, R., & Sachs, G. S. (2005). Clinical and diagnostic implications of lifetime attention-deficit/hyperactivity disorder comorbidity in adults with bipolar disorder: Data from the first 1000 STEP-BD participants. Biological Psychiatry, 57(11), 1467–1473. https://doi.org/10.1016/j.biopsych.2005.01.036
Faraone, S. V., Biederman, J., Mennin, D., Wozniak, J., & Spencer, T. (1997). Attention-deficit hyperactivity disorder with bipolar disorder: A familial subtype? Journal of the American Academy of Child and Adolescent Psychiatry, 36(10), 1378–1387. https://doi.org/10.1097/00004583-199710000-00020
Barkley, R. A., Murphy, K. R., & Fischer, M. (2008). ADHD in adults: What the science says. Guilford Press.
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About the Author
Joseph S. Volpe, Ph.D.
Clinical Psychologist
Joseph S. Volpe, Ph.D. is a Clinical Psychologist with over 30 years of experience specializing in ADHD, learning disabilities, autism spectrum disorder, anxiety, and traumatic stress. He is an ADHD Certified Clinical Services Provider (ADHD-CCSP), a Board Certified Telehealth Professional, and a Certified Clinical Trauma Professional (CCTP).
Dr. Volpe holds an Adjunct Professor appointment in the Department of Counseling and Mental Health Professions at Hofstra University's School of Health Sciences and is co-author of two nationally recognized crisis response guides used in schools and universities.
Dr. Volpe is the Executive Director of Volpe Psychological Services, P.C., which provides comprehensive psychoeducational evaluations and telehealth psychology services for adolescents and adults throughout New York State — including ADHD evaluations, learning disability assessments, autism evaluations, and treatment for anxiety, depression, and traumatic stress. Most services are delivered through telehealth throughout New York State, with in-person appointments available. Please contact the practice to discuss your needs and appointment options.
