misdiagnose

IPA/ˌmɪsdaɪəɡˈnəʊz/
KK[mɪsdˌaɪɪɡnˈoz]IPA/ˌmɪsdaɪəɡˈnəʊz/

misdiagnose — verb

  • misdiagnosepresent simple I / you / we / they
  • misdiagnoseshe / she / it
  • misdiagnosedpast simple
  • misdiagnosing-ing form

1. to wrongly decide which illness or medical condition a patient has, telling them

1.verbtransitiveC1
Definition

to wrongly decide which illness or medical condition a patient has, telling them they have one thing when really they have another.

Example

Doctors at the small clinic misdiagnosed Saira's asthma as a chest cold for nearly a year.

misdiagnose + [condition A] as [condition B]

Caleb was misdiagnosed with anxiety, but the real problem was an overactive thyroid.

passive: be misdiagnosed with + [condition]

Common collocations
  • misdiagnose + as
  • be misdiagnosed with
  • frequently/often misdiagnosed
  • initially misdiagnosed
Synonyms
  • misidentify

    more general; covers any wrong identification, not specifically illness

  • mistake (for)

    everyday verb; 'mistake X for Y' often used by patients describing what happened

Antonyms

Grammar Patterns

misdiagnose + someone

misdiagnose + someone + as having + condition

be misdiagnosed with + condition

Usage Note

Subject is usually a doctor, hospital, or medical system; object is the patient or the illness. Frequently passive in news and research writing, where the patient is the topic.

Common Mistakes

The doctor mis-diagnosed Theo.
The doctor misdiagnosed Theo.
written as one word, no hyphen.
My headaches were misdiagnosed by a wrong doctor.
My headaches were misdiagnosed by an inexperienced doctor.
'misdiagnose' already means the decision was wrong, so 'wrong doctor' is redundant; describe the doctor instead.

2. to give a wrong explanation of what is causing a problem, or to wrongly say what

2.verbtransitiveC1
Definition

to give a wrong explanation of what is causing a problem, or to wrongly say what kind of thing or person something is, outside the medical sense.

Example

Analysts had misdiagnosed the company's losses as a marketing failure when the real cause was supply-chain delays.

misdiagnose + [problem] as + [wrong cause]

Kenji argued that politicians keep misdiagnosing rural poverty as a problem of laziness instead of missing jobs.

common in policy/social commentary

Common collocations
  • misdiagnose the problem
  • misdiagnose the cause
  • misdiagnose the situation
Synonyms
  • misread

    less formal; works for situations and signals (misread the market)

  • misinterpret

    focuses on understanding evidence wrongly, not on naming the cause

Grammar Patterns

misdiagnose + [problem]

misdiagnose + [problem] + as + [cause]

Usage Note

Distinguish from sense 1: here the object is a non-medical problem (an economic loss, a social trend, a sports slump). Subject is typically an analyst, official, or institution speaking in a quasi-expert voice.

Common Mistakes

The mechanic misdiagnosed my car.
The mechanic wrongly identified the problem with my car.
for everyday non-medical contexts (cars, appliances), 'misdiagnose' sounds formal; native speakers usually say 'wrongly identify the problem' or 'get the diagnosis wrong'.

Word family

Synonym discussion

Sense: verb/1

All three describe getting an identification wrong, but they sit in different registers and contexts. 'Misdiagnose' is the formal, medical-leaning term: a doctor or institution names the wrong illness or condition. It carries weight because real harm can follow — the wrong treatment, a missed disease. 'Misidentify' is broader and more neutral: you could misidentify a bird, a suspect, or the cause of a crash. It does not imply a professional judgement, only a wrong label. 'Mistake' is the everyday verb that patients themselves use: 'They mistook my migraine for a stroke.' If you write in a news or research voice, choose 'misdiagnose' for illnesses, 'misidentify' for general wrong labels, and 'mistake (for)' when telling the patient's story.

misdiagnose ↗misidentifymistake ↗

Common collocations

Nouns

Adverbs

Phrases

  • misdiagnose [X] as [Y]
  • be misdiagnosed with
  • wrongly diagnosed

Prepositions

  • as
  • with (in passive: misdiagnosed with X)

Etymology

GreekLatinEnglish

Formed in English by adding the prefix 'mis-' (meaning 'wrongly' or 'badly', from Old English) to the verb 'diagnose'. 'Diagnose' itself was created in the 19th century from the medical noun 'diagnosis', which comes through Latin from Greek 'diagignōskein' — 'to know apart, to distinguish'. So at root, to misdiagnose is literally to fail at telling one condition apart from another.