Author Insight

Differentiating Bipolar Spectrum Disorders From Other Psychiatric Disorders With Shared Features

Mohamed Soliman, MD, on why bipolar disorder often hides inside familiar symptoms, the four questions that reveal the underlying pattern, and how to choose the right screening tool for your setting.

August 21, 2026

Watch Expert Commentary

Mohamed Soliman, MD, explains how to recognize bipolar spectrum disorders hidden within familiar symptoms, and how to choose the right screening tool for your clinical setting.

Author Insight

In this video, Mohamed Soliman, MD, of the Dauten Family Center for Bipolar Treatment Innovation at Massachusetts General Hospital and Harvard Medical School, distills the central message of his paper: bipolar disorder often hides inside familiar symptoms. Depression, anxiety, irritability, poor concentration, impulsivity, and disturbed sleep appear across many conditions, so the diagnostic challenge is rarely recognizing the symptom, it is reading the pattern around it. Four questions bring that pattern into focus: When did the symptom begin? How long did it last? What triggered it? And did it represent a clear change from the person’s baseline? Poor sleep with anxiety leaves someone exhausted, while in hypomania a person may sleep only a few hours and feel energized; anxious racing thoughts loop around threat, while in bipolar disorder they may turn expansive and tied to new plans. ADHD symptoms usually persist across time, whereas bipolar symptoms cluster into episodes.

On screening, Dr. Soliman’s point is that no single tool is best; each answers a slightly different question, so the right choice depends on setting and population. The Rapid Mood Screener (RMS) is a practical first step in busy primary care, six items in about two minutes with strong performance for bipolar I. The Mood Disorder Questionnaire (MDQ) performs well in psychiatric settings but loses sensitivity in community populations and can miss bipolar II. The Hypomania Checklist-32 helps with subtler presentations but yields more false positives, and the Bipolar Spectrum Diagnostic Scale captures softer or atypical cases. Crucially, screening does not establish a diagnosis; it tells you when a story deserves a closer look.

The clinical implication runs deeper than any one tool. Many patients first present during depression, and in primary care populations with depression, bipolar spectrum disorders may occur in roughly one in six. That argues for asking about lifetime changes in energy, sleep, and impulsivity, family history, and any prior activation after antidepressants, not just the current depressive symptoms. More broadly, psychiatric diagnosis works best when clinicians move from isolated symptoms to patterns across time. Future work will likely pair more sensitive screening with collateral history, repeated measurement, and digital tracking of sleep and activity, but technology is unlikely to replace the core clinical task of understanding how a symptom moves and how it changes a person’s life.

Key Takeaways

  • Bipolar disorder often hides inside familiar, nonspecific symptoms; the diagnostic signal is the pattern around a symptom, not the symptom itself.
  • Four questions clarify that pattern: when the symptom began, how long it lasted, what triggered it, and whether it marked a clear change from baseline.
  • No single screening tool is best. Match the tool to the setting: RMS for busy primary care, MDQ in psychiatric settings, HCL-32 for subtler presentations, BSDS for atypical ones, and treat all as flags, not diagnoses.
  • Among primary care patients with depression, bipolar spectrum disorders may affect roughly one in six, so ask about lifetime energy, sleep, impulsivity, family history, and prior antidepressant activation.
  • Psychiatric diagnosis works best by tracking how symptoms move across time, a task that collateral history, repeated measures, and digital tools support but do not replace.
In psychiatry, the pattern often reveals what the symptom alone can't.

Featured Articles

Prim Care Companion CNS Disord. 2026;28(3):25f04157

The paper behind this video, co-authored with Sharmin Ghaznavi, David Mischoulon, and Theodore Stern. It lays out practical strategies for telling bipolar spectrum disorders apart from conditions with overlapping features, including how the major screening tools differ and when each fits. It matters clinically because misreading bipolarity as unipolar depression, anxiety, or ADHD shapes treatment decisions, and this offers a structured way to read the pattern rather than the isolated symptom.

Read the Study