How to Use undiagnosed in a Sentence

undiagnosed

adjective
  • There are a lot of people who have sleep apnea that are undiagnosed.
    — Meghan Bartels, Scientific American, 29 June 2023
  • The latter are often undiagnosed for years and are thought to lead to many strokes as well.
    — Clifton Leaf, Fortune, 31 Oct. 2017
  • That has raised fears that there could be hundreds of undiagnosed cases in the area.
    — Gene Johnson, Anchorage Daily News, 3 Mar. 2020
  • To be fair, yes, most women with undiagnosed breast cancer don’t have pain.
    — Korin Miller, SELF, 20 Feb. 2025
  • The toddler can't retain food, is on a milk diet and has gone undiagnosed for months.
    — Rosa Flores and Julia Jones, CNN, 1 Sep. 2022
  • But her symptoms, which at this point were still undiagnosed, were still mostly a secret.
    — Hedy Phillips, People.com, 11 Jan. 2025
  • Both cases were found to have undiagnosed cancers.
    — Beth Mole, ArsTechnica, 17 June 2026
  • Ann says her father struggled with undiagnosed mental illness for most of his life.
    — Allison Norlian, Forbes, 5 Apr. 2021
  • She was also found to have an undiagnosed heart condition.
    — Abigail Adams, PEOPLE, 28 Jan. 2026
  • The study did not address how many people might have undiagnosed infections now.
    — BostonGlobe.com, 24 June 2021
  • The illness, as yet undiagnosed, made her vomit sharply, as if throwing up bullets.
    — Luis Pascal, Miami Herald, 28 Nov. 2025
  • My wife has been suffering from a so-far-undiagnosed severe pain following hip surgery last year.
    — WSJ, 31 Aug. 2021
  • And many people use melatonin for undiagnosed sleep conditions that may not warrant its use.
    — Sally Ibrahim, The Conversation, 23 June 2026
  • Doctors say there is a high likelihood of other undiagnosed cases of this virus.
    — Caroline Judelson, Fox News, 21 June 2018
  • Alpha-gal syndrome may be far more common than once thought, with many cases going undiagnosed.
    — Tom Gavin, EverydayHealth.com, 3 Apr. 2026
  • Willow was later found to have had an undiagnosed heart condition.
    — Alice Gibbs, MSNBC Newsweek, 21 Nov. 2025
  • But the hits go on—and so will the concussions, and those spells of dizziness, headaches, and fuzzy memories which go undiagnosed.
    — Louisa Thomas, The New Yorker, 12 Oct. 2022
  • Many remain undiagnosed for years, sometimes decades.
    — Alexandra Sifferlin, STAT, 31 Mar. 2026
  • As a kid with learning differences, whose undiagnosed dyslexia put him behind in school.
    — Lorraine Ali, Los Angeles Times, 4 Mar. 2026
  • One of Afrin’s first patients had spent a decade with undiagnosed fatigue, as well as sudden bouts of itching across her body.
    — Kate Raphael, Discover Magazine, 23 June 2025
  • The number is likely higher since many people with the illness go undiagnosed.
    — From Usa Today Network and Wire Reports, USA TODAY, 15 Sep. 2020
  • An 11-year-old girl died in her sleep from a heart attack — the result of an undiagnosed and very rare heart condition.
    — Cara Lynn Shultz, People.com, 30 Oct. 2024
  • Lily's been fighting an undiagnosed bone marrow condition, but her mom says the music brought light to a tough journey.
    — Bryan West, Nashville Tennessean, 23 Oct. 2025
  • One problem that is often undiagnosed is the fact that the algorithms themselves can be biased.
    — Janice Gassam Asare, Forbes, 25 Jan. 2022
  • Sleep apnea thus remains undiagnosed far too often in women and also in other groups.
    — Erika Yamazaki, The Conversation, 6 May 2026
  • My body and mind were shutting down after years of undiagnosed alcoholism, drug abuse, and suicidal ideation.
    — Outside Online, 3 Dec. 2025
  • Most of them are younger and less likely to have smoked than typical lung tumor patients, and often go undiagnosed early on.
    — Naomi Kresge, Fortune Well, 22 Oct. 2023
  • The true toll of the virus is likely to be worse than the numbers show, as mild or asymptomatic infections often go undiagnosed.
    — Emma Reynolds and Henrik Pettersson, CNN, 5 June 2020
  • Sánchez Bezos grew up with undiagnosed dyslexia.
    — James Pollard, Fortune, 17 Dec. 2025
  • About 6 million dogs are diagnosed with cancer each year in the nation, and many more likely go undiagnosed.
    — San Diego Union-Tribune, 9 Dec. 2021

Some of these examples are programmatically compiled from various online sources to illustrate current usage of the word 'undiagnosed.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

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