un·​di·​ag·​nosed | \ ˌən-ˌdī-ig-ˈnōst, -əg-, -zd\

Definition of undiagnosed

: not diagnosed : not identified through diagnosis an undiagnosed illness … the symptoms of the syndrome may be subtle and thus may remain undiagnosed.— Dwight R. Robinson a condition that often goes undiagnosed

Examples of undiagnosed in a Sentence

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Tension headaches can be caused by everything from dehydration and workplace stress to undiagnosed diabetes or an autoimmune disease. Amy Marturana, SELF, "What Your Headaches Can Tell You About Your Health," 29 Dec. 2018 Many survivors endured lingering PTSD, a psychological disorder that often went undiagnosed during this time. Matt Blitz, Popular Mechanics, "Pearl Harbor Still Holds a Few Mysteries," 7 Dec. 2018 The study, led by researchers at the Centers for Disease Control and Prevention, traced a puzzling cluster of Ebola cases in Liberia to a mother who appeared to have had a stealthy, undiagnosed infection for more than a year. Beth Mole, Ars Technica, "Ebola mysteriously hid in a woman for more than a year before spreading," 27 July 2018 By some estimates, only 45 percent of people who have HCV know it; even more might go undiagnosed (and untreated) without the ACA, which covers hep C testing as one of the recommendations of the U.S. Preventative Services Task Force. Dorri Olds, Woman's Day, "I Might Not Be Alive Today If It Weren't for Obamacare," 14 Feb. 2017 Children with undiagnosed concussions are at risk for another one and longer recovery times. The Associated Press Health & Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. Lindsey Tanner, The Seattle Times, "New advice on kids’ concussions calls for better tracking," 4 Sep. 2018 In turn, some women may have heart problems or other health issues that go undiagnosed until cardiovascular complications in pregnancy arise. Olivia Campbell, SELF, "How California Cut Its Maternal Death Rate in Half," 9 Aug. 2018 Therapy Millions of people suffering from mental health issues are left untreated and undiagnosed. Leigh Kamping-carder, WSJ, "Robots Are Ready to Shake (and Stir) Up Bars," 19 July 2018 All that time without treatment means the undiagnosed diabetes can quietly wreak havoc, eventually causing problems like blurred vision and nerve damage, reports the Mayo Clinic. Colleen Stinchcombe, Woman's Day, "What's the Difference Between Type 1 and Type 2 Diabetes?," 10 Sep. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'undiagnosed.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of undiagnosed

1864, in the meaning defined above

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Last Updated

8 Jan 2019

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Time Traveler for undiagnosed

The first known use of undiagnosed was in 1864

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More Definitions for undiagnosed


un·​di·​ag·​nosed | \ -ˈnōst \

Medical Definition of undiagnosed

: not diagnosed : eluding diagnosis undiagnosed disease

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to gather or build up little by little

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