Complication vs Problem

When to use each in English, with meaning, register, and examples.

Complication

Top 2,000 (common)C1noun

Problem

Top 1,000 (very common)A1noun
Most common: Problem
 ComplicationProblem
Pronunciation🇬🇧 /["/ˌkɒmplɪˈkeɪʃn/"]/🇺🇸 /["/ˌkɑːmplɪˈkeɪʃn/"]/🇬🇧 /["/ˈprɒbləm/"]/🇺🇸 /["/ˈprɑːbləm/"]/
MeaningA problem or difficulty that makes something harder.A difficulty or issue that needs to be solved.
ExampleThe surgeon explained that there could be a complication during the procedure.Math can be hard, but I will solve this problem.
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 1,000 (very common)
CEFR levelC1A1
Part of speechnounnoun
Collocationsmajor, added, additional, add, cause, avoid, arise, ensue, occur, acute, dangerous, life-threatening, develop, have, suffer, arise, develop, occur, rate, complication with, complication from, complication of, a risk of complications, complications related to somethingacute, big, enormous, host, set, be, pose, present (somebody with), arise, come up, crop up, area, spot, behaviour/​behavior, problem about, problem for, problem of, an approach to a problem, the crux of the problem, the heart of the problem, complicated, difficult, easy, do, find the answer to, solve, set
Antonymssolution, simplicity, resolutionsolution, answer, resolution
Common mistakesConfused with 'complicating' which implies making something difficult., Using 'complication' in contexts unrelated to problems, like 'easy' situations.'Problem' is often confused with 'trouble'—these words have slightly different meanings., Some learners may use 'problems' incorrectly with uncountable nouns., Use the phrase 'to solve a problem' instead of 'to fix a problem'.
Usage notesUse 'complication' when discussing medical issues or difficulties in plans. Avoid in casual conversations unless talking about serious matters.Use 'problem' in both formal and informal contexts. Avoid using in overly casual situations when a lighter term might fit, like 'issue' or 'challenge'.

Frequently asked questions: Complication vs Problem

What's the difference between Complication and Problem?

Complication: A problem or difficulty that makes something harder. Problem: A difficulty or issue that needs to be solved.

Which is more common: Complication and Problem?

Problem is the most common in everyday English.

Which is more advanced: Complication and Problem?

Complication is the highest level, at C1, on the CEFR scale.

Are Complication and Problem the same CEFR level?

Complication: C1, Problem: A1 on the CEFR scale.

What part of speech are Complication and Problem?

Complication: noun, Problem: noun.

Can you show an example of each?

Complication: The surgeon explained that there could be a complication during the procedure. Problem: Math can be hard, but I will solve this problem.

Can I use Complication and Problem interchangeably?

Not always. Complication and Problem are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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