Causes vs Reasons vs Sources

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

Causes

Top 5,000 (fairly common)

Reasons

Top 1,000 (very common)

Sources

Top 5,000 (fairly common)
Most common: Reasons
 CausesReasonsSources
Pronunciation🇬🇧 //ˈkɔːzɪz//🇺🇸 //ˈkɔːzɪz//🇬🇧 //ˈriːzənz//🇺🇸 //ˈriːzənz//🇬🇧 //ˈsɔːsɪz//🇺🇸 //ˈsɔrsɪz//
MeaningThings that make something happen.causes or explanations for somethingPlaces or things that provide information or material.
ExampleSmoking causes many health problems.There are many reasons for climate change.The journalist checked several **sources** before publishing the news article.
RegisterNeutralNeutralNeutral
How commonTop 5,000 (fairly common)Top 1,000 (very common)Top 5,000 (fairly common)
Collocationscause for concern, cause of action, causes of death, common causes, underlying causesgive reasons, understand reasons, list reasons, have reasons, see reasonsinformation sources, primary sources, data sources, reliable sources, research sources
Antonymseffects, resultscauses, effectsdestinations, endpoints
Common mistakesConfusing 'causes' with 'effects' - remember, causes are the reasons for something happening., Using 'causes' as a singular noun instead of its plural form when referring to multiple reasons.Confusing 'reason' with 'purpose'., Using 'reasons' without 'for' in some contexts., Mixing singular and plural forms improperly.Confused with 'resources'; 'sources' refer to origins, while 'resources' refer to available materials., Using it as a singular noun; 'sources' is typically plural.
Usage notesUse 'causes' to describe the reason behind something happening. It's appropriate in both written and spoken contexts, especially in discussions about science or social issues.Used to explain why something happened or to provide justification. Formal in writing, casual in speech.Use 'sources' when referring to origins of information, data, or materials. It's less common to use it informally, and may not be suitable for casual conversations about everyday topics.

See it in real clips

Causes
Sources

Frequently asked questions: Causes vs Reasons vs Sources

What's the difference between Causes, Reasons, and Sources?

Causes: Things that make something happen. Reasons: causes or explanations for something Sources: Places or things that provide information or material.

Which is more common: Causes, Reasons, and Sources?

Reasons is the most common in everyday English.

Can you show an example of each?

Causes: Smoking causes many health problems. Reasons: There are many reasons for climate change. Sources: The journalist checked several **sources** before publishing the news article.

Can I use Causes, Reasons, and Sources interchangeably?

Not always. Causes, Reasons, and Sources 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.