Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
the cause why
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "the cause why" is not considered standard in written English and may sound awkward to some readers.
It can be used when explaining the reason behind something, but it is often better to use more concise alternatives. Example: "The cause why we decided to change the plan was due to unforeseen circumstances."
Science
News & Media
Academia
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
16 human-written examples
The cause why the angular particle morphology gives faster velocity in supersonic gas flow compared with the spherical one has to be investigated and clarified.
A structure that addresses only the effect (John acting out) rather than the cause (why John acted out) does little to prevent a similar situation from happening the next day or next week.
Academia
George Monbiot argues of nuclear energy that the absence of less harmful alternatives has "converted me to the cause" (Why Fukushima made me stop worrying and love nuclear power, 21 March).
News & Media
It's not hard to see why Steven Spielberg has become a supporter of the cause, why George Clooney has, why Mick Jagger made a video appeal on their behalf.
News & Media
The cause why the daytime F-region irregularities started from F-region peak will be discussed in the later section.
This may be the cause why the observed impact of anaerobic incubation on phytotoxicity was greater for florfenicol.
Human-verified similar examples from authoritative sources
Similar Expressions
44 human-written examples
The causes why philosophy is in such an evil name have now been sufficiently explained: the injustice of the charges against her has been shown-is there anything more which you wish to say?
In other words, the causes why clinical situation deteriorates are not clearly known.
Science
It is one of the causes why people don't insure.
Science
This could be one of the causes why few exotics (≈10%% of the total ≈10%% successful introductions to non-native ranges) reproduce and could become invasive.
Science
Even if in another countries research has shown the importance of factors such as stigma, religious beliefs or migration status, in Spain no qualitative study has been developed yet to investigate the causes why immigrant women stop HIV treatment.
Science
Expert writing Tips
Best practice
While "the cause why" is understandable, opt for more common and grammatically streamlined alternatives like "the reason why" or "the cause of" for improved clarity and flow in your writing.
Common error
Avoid using "the cause why" in sentences where the "why" is already implied by the context. For example, instead of "The cause why the project failed was lack of funding", write "The reason the project failed was lack of funding" or "The project failed because of lack of funding."
Source & Trust
83%
Authority and reliability
3.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "the cause why" functions as a causal connector, linking an event or situation to its underlying reason. Ludwig AI indicates this usage, though it also suggests that more concise alternatives exist for enhanced clarity.
Frequent in
Science
43%
News & Media
33%
Academia
19%
Less common in
Wiki
4%
Formal & Business
1%
Reference
0%
Ludwig's WRAP-UP
In summary, while grammatically acceptable, the phrase "the cause why" is often considered less polished than alternatives like "the reason why" or "the cause of". Ludwig AI's analysis suggests that this phrase functions as a causal connector, explaining the reasons behind events. It appears most frequently in scientific and news-related contexts, and the expert rating reflects its acceptable but not preferred status. For clearer and more impactful writing, consider using the suggested alternatives. Ludwig can help you choose the best option.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
the reason why
More common and direct way to express the cause or explanation.
the reason that
Similar to 'the reason why' but omits the 'why', offering a slightly more concise option.
the cause for
Uses 'for' instead of 'why' to indicate the reason or basis.
the explanation for
Replaces "cause" with "explanation", emphasizing the clarifying aspect.
the grounds for
More formal, indicating the basis or justification for something.
the source of
Focuses on the origin or starting point of the cause.
the basis for
Highlights the underlying foundation or rationale.
the origin of
Points to the beginning or root of the cause.
the motive for
Specifies the driving force or intention behind the cause.
the impetus behind
Emphasizes what initiated or propelled the cause.
FAQs
What is a more common way to say "the cause why"?
A more common and preferred alternative is "the reason why". It is generally considered more grammatically sound and less awkward.
Is "the cause why" grammatically incorrect?
While not strictly incorrect, "the cause why" is often considered redundant. The word "why" implies a cause or reason, making "the cause" somewhat repetitive. It's better to use alternatives like "the reason why".
When is it appropriate to use "the cause why"?
Although not the best option, "the cause why" can be used in informal contexts where strict grammatical precision is not required. However, in formal writing, it is advisable to use alternatives such as "the reason for".
What's the difference between "the cause why" and "the reason why"?
"The cause why" and "the reason why" are very similar in meaning, but "the reason why" is the more accepted and frequently used phrasing. It's clearer and more concise.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
83%
Authority and reliability
3.5/5
Expert rating
Real-world application tested