What does misdiagnose mean?
To misdiagnose is to identify an illness, condition, or case incorrectly, usually by giving it the wrong medical label. The word is especially common when a disorder has unusual symptoms, resembles a more familiar condition, or falls outside a clinician's area of expertise. A misdiagnosis matters because it can lead to ineffective or inappropriate treatment, unnecessary procedures, or a delay in receiving proper care. The word may also be used more broadly for serious mistakes in classification or interpretation, although medical usage is its dominant sense. For example, a condition may be described as being commonly misdiagnosed as a particular infection when testing eventually reveals a different cause. The related noun is misdiagnosis, while the standard inflectional forms include misdiagnosed and misdiagnosing. The prefix mis- indicates that the act of diagnosing has been performed incorrectly, not that no diagnosis was attempted.
verbTo identify incorrectly the cause, nature, or condition of an illness or other medical case. It can also mean to characterize or interpret something wrongly.
- To identify incorrectly the cause, nature, or condition of an illness or medical case.
- To characterize, classify, or interpret something incorrectly.
"The rare disorder was initially misdiagnosed as a common viral infection."
"Her symptoms were misdiagnosed for several months before a specialist identified the cause."
"Commentators misdiagnosed the policy failure as a simple shortage of funding."
Misdiagnose captures the costly difference between identifying a condition and identifying the wrong one.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does misdiagnose come from?
Misdiagnose combines the prefix mis-, meaning wrongly or incorrectly, with the verb diagnose. Diagnose entered English through Latin diagnōsis, from the Greek diagnōsis, itself associated with diagōgnoskein, “to distinguish” or “to discern.” Greek terms meaning “to distinguish through knowledge” also underlie diagnosis, diagnostic, and diagnostics. Modern English forms such as misdiagnose follow the established use of mis- to reverse or negate the favourable or correct meaning of a base word.
Related word forms
How misdiagnose is actually used
In medicine, the term is used when a condition is assigned the wrong diagnosis, often with potentially serious consequences because treatment may be inappropriate or delayed. Outside medical contexts, it is also used more generally for serious or consequential errors in interpretation.
Easily confused with misdiagnose
To diagnose is to determine the nature or cause of a condition correctly, whereas to misdiagnose is to identify it incorrectly.