There was one that worked beautifully for four months, then quietly stopped.
The ones after it were not wrong, exactly. None were enough. Eight years of that.
Bipolar disorder misdiagnosed as depression rarely looks like a dramatic missed call. It looks like a chart of antidepressant trials that half worked, and one question nobody asked.
What were you like during the stretches when you felt good?
Not “better.” Good. The ten days you slept four hours a night, cleared a year of email at 2 a.m., and felt like the person everyone else gets to be.
You would not have brought those weeks to an appointment.
If you are in crisis or thinking about harming yourself, please do not wait. Call or text 988 to reach the Suicide & Crisis Lifeline, available 24/7, or go to your nearest emergency room. For a non-urgent appointment, our Fort Worth office is at 817-659-7344.
First: this is not a reason to change your medication
If reading this makes you want to stop your antidepressant, please do not, and please do not stop abruptly. The National Institute of Mental Health is blunt about it: “Avoid stopping medication without talking to your health care provider first.”
Nothing here says your diagnosis is wrong. Only that there is a question worth raising at a bipolar disorder evaluation, with a clinician who knows you.
Bipolar disorder misdiagnosed as depression: why the good weeks go unreported
People come to psychiatry when they are suffering. You book during the flat months, describe the flat months, and the intake note gets depression.
Hypomania arrives disguised as capability. NIMH defines bipolar II by depressive and hypomanic episodes rather than manic ones, and calls hypomanic episodes “less severe.” Less disruptive tends to mean less memorable, which is part of why bipolar 2 is mistaken for depression more readily than bipolar I.
A 2010 NIMH science update on a study of 5,692 respondents in the National Comorbidity Survey Replication reported that “nearly 40 percent of those identified as having major depression also had symptoms of subthreshold hypomania.” That figure counts unreported symptoms, not misdiagnoses.
A 2025 systematic review and meta-analysis in the British Journal of Psychiatry put the pooled average duration of untreated or undiagnosed bipolar disorder at about nine years.
What hypomania actually requires
A SAMHSA comparison table on NCBI Bookshelf and the NIH-hosted StatPearls review both put a hypomanic episode at four consecutive days or more, present most of the day nearly every day, plus a required number of symptoms, which range from reduced need for sleep to spending sprees.
Two more criteria do the real work: the change has to be clearly unlike the person’s usual self and noticeable to other people. Somebody saw it, which is why bringing a spouse or sibling can change what an evaluation finds.
NIMH puts manic episodes at “at least 7 days (most of the day, nearly every day) or when manic symptoms are so severe that hospital care is needed.” Hypomania, by definition, does not cause marked impairment, require hospitalization, or involve psychotic features. None of this is a checklist to run on yourself.
What makes a clinician take a second look?
| What a clinician asks | Why it comes up |
| How many antidepressants, and what happened on each? | Repeated partial or short-lived responses matter |
| What were the first weeks on a new medication like? | New agitation or insomnia needs accounting for |
| Any bipolar disorder in the family? | NIMH notes it often runs in families |
| Any stretches of much less sleep and unusual drive? | The history that goes unreported |
If you have wondered why antidepressants stop working for you, this is one possible explanation among several. No single row means anything alone. Our team works through all of them at a first evaluation, then asks whoever came with you.
“I get moody” carries no information. Describing the stretch does:
- “My partner says a few times a year I get talkative and hard to interrupt for a week.”
- “Two weeks after starting the new medication I felt wired, could not sleep, and spent money I never would otherwise.”
Bring the medication list too, with dates and what happened on each.
What antidepressants have to do with this
NIMH states it plainly: “If subtle signs of bipolar disorder are missed and an initial depressive episode is treated with antidepressant medication alone (without a mood stabilizer), a manic episode or rapid cycling may be triggered.”
Antidepressants do not cause bipolar disorder. The concern is a switch, to hypomania, mania, or a mixed state, in someone who already has it.
The main consensus statement is over a decade old. In 2013 the International Society for Bipolar Disorders task force published a systematic review and consensus in the American Journal of Psychiatry and found a “striking incongruity between the wide use of and the weak evidence base.” It recommends avoiding antidepressant monotherapy in bipolar I disorder, while allowing that individual patients may benefit.
It also advises against antidepressant monotherapy in bipolar I or II depression when two or more core manic symptoms are present at once, and against antidepressants in people with rapid cycling, frequent episodes, or mixed states. Bipolar II is not a category the caution skips.
The risk is also not uniform across drugs. It graded this literature C on an A-to-D scale and cites a 12-month trial in which switching ran 9 percent for sertraline, 10 percent for bupropion, and 29 percent for venlafaxine, plus an earlier meta-analysis in which switch was more common with tri- and tetracyclics (11.2 percent) than with SSRIs (3.7 percent) or placebo (4.2 percent). Its summary: switching “may be limited to certain antidepressant classes.” Which medication is part of the question, and that one is for your prescriber.
A 2022 meta-analysis in Psychopharmacology Bulletin compared second-generation antidepressant monotherapy with lithium in bipolar II depression and found no significant difference in switch rates. But it pooled only two trials and 223 patients, with a confidence interval from 0.29 to 2.47, wide enough to fit benefit or harm. Unsettled, not reassuring.
All of this literature is written for prescribers, not for you.
How bipolar disorder is diagnosed
A 2013 study in Psychiatry Journal used the Mood Disorder Questionnaire in depressed primary care patients, and its authors were explicit that such instruments carry no diagnostic properties. A screener that flags you points your clinician toward a question worth asking in person, and it cannot answer that question itself.
NIMH says a provider may examine you and order testing to rule out other illnesses, then refer you to a mental health professional for evaluation. Most of the work is a history of mood, sleep, and functioning across years. It usually takes more than one visit, and no online quiz can do it.
Raising it sooner matters. NIMH notes that bipolar disorder “can be an important factor in suicide,” and a 2019 review in Medicina puts the risk of death by suicide, measured across whole populations rather than for any individual, at up to 10 to 30 times that of the general population, concentrated in depressive and mixed states rather than hypomanic ones. Nor is that multiple fixed: NIMH notes lithium can decrease the risk of suicide. If you are having thoughts of harming yourself, call or text 988, or go to your nearest emergency room.
What changes if the diagnosis turns out to be bipolar disorder?
A 2007 NIMH science update on a survey of 9,282 U.S. adults found that among those in treatment for bipolar spectrum disorder, only about 40 percent were on appropriate medication, many taking an antidepressant with no mood stabilizer. The diagnosis decides what sits at the center of treatment.
We provide TMS and ketamine infusion therapy. Both are off-label for bipolar depression, and neither settles a diagnostic question.
The November 2025 clearance for the BrainsWay Deep TMS System, K251391, covers depressive episodes in adults with major depressive disorder who did not improve enough on earlier antidepressants, and the word “bipolar” does not appear in it. TMS for bipolar depression is off-label, the research is limited, and these devices are FDA-cleared, not FDA-approved.
The IV ketamine we provide is used off-label for depression and is considered investigational by the FDA. In bipolar depression, a 2021 systematic review in the International Journal of Neuropsychopharmacology found six studies covering 135 people, with the level of proof of efficacy rated low. In every one, participants stayed on a mood stabilizer, the only condition under which this has been studied.
If the diagnosis is off, no device corrects it. Answer that before anyone settles on treatment-resistant depression as the explanation.
Frequently asked questions
Why is bipolar disorder misdiagnosed as depression so often?
Because people seek care during the depressed stretches and rarely report the good ones. In a 2007 NIMH science update, researchers speculated that doctors treating anxiety, depression or substance abuse “may not be detecting an underlying bipolar condition.” A 2010 NIMH update reported that nearly 40 percent of adults identified as having major depression also had symptoms of subthreshold hypomania.
What is the difference between bipolar I and bipolar II?
NIMH defines bipolar II by depressive and hypomanic episodes rather than manic ones, and calls hypomanic episodes “like manic episodes but are less severe.” Hypomania requires at least four days, mania at least seven, or less when symptoms need hospital care. Because hypomania disrupts less, bipolar II is more often recorded as depression.
What does hypomania feel like, and why do people not mention it?
Often it feels like relief, or competence: less need for sleep without feeling tired, faster thinking, more projects, sometimes irritability and impulsive spending. It does not feel like an illness, so it gets remembered as a good month rather than reported.
My antidepressant made me feel wired. Does that mean I have bipolar disorder?
Not by itself. Agitation and insomnia after starting a medication have several explanations. The ISBD task force report notes that in bipolar disorder, antidepressants are sometimes associated with new or worsening irritability or agitation, and that many cases of agitated depression in bipolar patients, with new-onset insomnia, impulsivity, and suicidal preoccupations, have followed newly started antidepressants. Do not change the medication yourself and do not wait for your next visit: call your prescriber. If you are having thoughts of harming yourself, call or text 988.
The bottom line
Bipolar disorder usually gets missed not because of a careless examiner but because of a history that never got told: the good weeks did not feel like something to report. Short-lived antidepressant responses, agitation on a new medication, bipolar disorder in the family, high energy on little sleep: questions to raise at an evaluation, not conclusions to reach alone. Plenty of people who raise them keep the diagnosis they already had.
Talk with us
If you are in Fort Worth or the surrounding North Texas area and what you have read here sounds familiar, we would be glad to talk it through with you. The Institute for Advanced Psychiatry is an outpatient practice at 6800 Harris Parkway, Suite 100, treating adults 18 and older. You can request an appointment or call 817-659-7344.
If you are in crisis or thinking about harming yourself, please do not wait for an appointment. Call or text 988 to reach the Suicide & Crisis Lifeline, available 24/7, or go to your nearest emergency room.
Sources
- National Institute of Mental Health. “Bipolar Disorder.” Accessed 2026. https://www.nimh.nih.gov/health/publications/bipolar-disorder
- National Institute of Mental Health. “Symptoms of Bipolar Disorder May Go Undiagnosed in Some Adults with Major Depression.” 2010. https://www.nimh.nih.gov/news/science-updates/2010/symptoms-of-bipolar-disorder-may-go-undiagnosed-in-some-adults-with-major-depression
- National Institute of Mental Health. “Bipolar Spectrum Disorder May Be Underrecognized and Improperly Treated.” 2007. https://www.nimh.nih.gov/news/science-updates/2007/bipolar-spectrum-disorder-may-be-underrecognized-and-improperly-treated
- Substance Abuse and Mental Health Services Administration, NCBI Bookshelf. “Table 3.8, DSM-IV to DSM-5 Hypomania Criteria Comparison,” in Impact of the DSM-IV to DSM-5 Changes on the National Survey on Drug Use and Health. 2016. https://www.ncbi.nlm.nih.gov/books/NBK519704/table/ch3.t9/
- Jain A, Mitra P. “Bipolar Disorder.” StatPearls, NCBI Bookshelf. Updated 2023. https://www.ncbi.nlm.nih.gov/books/NBK558998/
- Keramatian K, Pinto JV, Tsang VWL, Chakrabarty T, Yatham LN. “Duration of untreated or undiagnosed bipolar disorder and clinical characteristics and outcomes: systematic review and meta-analysis.” The British Journal of Psychiatry. 2025. https://www.cambridge.org/core/journals/the-british-journal-of-psychiatry/article/duration-of-untreated-or-undiagnosed-bipolar-disorder-and-clinical-characteristics-and-outcomes-systematic-review-and-metaanalysis/A99924A2406C52314562703CB41DF5EA
- Pacchiarotti I, Bond DJ, Baldessarini RJ, et al. “The International Society for Bipolar Disorders (ISBD) Task Force Report on Antidepressant Use in Bipolar Disorders.” American Journal of Psychiatry. 2013;170(11):1249-1262. PMID 24030475. Free full text: https://pmc.ncbi.nlm.nih.gov/articles/PMC4091043/
- “Short Term Second-Generation Antidepressant Monotherapy in Acute Depressive Episodes of Bipolar II Disorder: A Systematic Review and Meta-Analysis.” Psychopharmacology Bulletin. 2022. https://pmc.ncbi.nlm.nih.gov/articles/PMC9172552/
- Sasdelli A, et al. “Screening for Bipolar Disorder Symptoms in Depressed Primary Care Attenders: Comparison between Mood Disorder Questionnaire and Hypomania Checklist (HCL-32).” Psychiatry Journal. 2013. https://pmc.ncbi.nlm.nih.gov/articles/PMC3820078/
- Dome P, Rihmer Z, Gonda X. “Suicide Risk in Bipolar Disorder: A Brief Review.” Medicina (Kaunas). 2019;55(8):403. https://pmc.ncbi.nlm.nih.gov/articles/PMC6723289/
- U.S. Food and Drug Administration. “510(k) Summary and Indications for Use, K251391 – BrainsWay Deep TMS System.” Cleared November 7, 2025. https://www.accessdata.fda.gov/cdrh_docs/pdf25/K251391.pdf
- Bahji A, Zarate CA Jr, Vazquez GH. “Ketamine for Bipolar Depression: A Systematic Review.” International Journal of Neuropsychopharmacology. 2021;24(7):535. https://academic.oup.com/ijnp/article/24/7/535/6261014
Medical disclaimer
This article is for general education and is not medical advice, a diagnosis, or a treatment recommendation for any individual. Reading it does not create a physician-patient relationship. Treatment decisions, including whether any medication or procedure is appropriate for you, should be made with a qualified clinician who knows your history. Do not start, stop, or change a psychiatric medication without talking to your prescriber. If you are experiencing a medical or mental health emergency, call 911 or 988.