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
serious illness
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase 'serious illness' is correct and usable in written English.
You can use it when you want to refer to a serious medical condition or ailment. For example: "My grandmother had a serious illness when she was younger, but she was cured eventually."
✓ Grammatically correct
News & Media
Science
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
60 human-written examples
Is there a serious illness?
News & Media
Multiple pregnancy and serious illness were excluded.
Yet serious illness took its inevitable toll.
News & Media
Only serious illness could justify her decision.
News & Media
Or they are diagnosed with a serious illness or injury.
Without sick pay, carers often continue through serious illness.
News & Media
Although rare, such infections may cause serious illness or death.
News & Media
Conversely, serious illness can also drive people into personal bankruptcy.
News & Media
Then, in 1898, Irving had his first serious illness.
Encyclopedias
I've faced serious illness and lost someone I love dearly.
News & Media
Deficiencies can lead to night blindness and serious illness.
News & Media
Expert writing Tips
Best practice
When discussing "serious illness", be specific about the type of illness if known to provide clarity and avoid generalizations.
Common error
Avoid attributing specific symptoms to a "serious illness" without proper medical knowledge or context, as symptoms vary widely depending on the ailment.
Source & Trust
84%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "serious illness" functions primarily as a noun phrase, acting as the subject or object in a sentence. Ludwig AI confirms that the phrase is grammatically correct and commonly used in written English. Examples show it describing a state of health or a medical condition.
Frequent in
News & Media
48%
Academia
18%
Wiki
12%
Less common in
Science
12%
Encyclopedias
4%
Formal & Business
4%
Ludwig's WRAP-UP
In summary, "serious illness" is a grammatically sound and frequently used phrase to denote a grave health condition. As Ludwig AI confirms, it finds relevance across diverse contexts, predominantly within news, academic, and scientific domains. While typically neutral in tone, its formality can shift based on the setting. To ensure clarity, be specific when detailing the type of "serious illness", and be cautious about attributing symptoms without proper backing. Alternatives like "grave sickness" or "critical condition" offer nuanced expressions for similar situations.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
grave sickness
Replaces "illness" with "sickness", implying a severe or critical state of health.
critical condition
Focuses on the severity of the health state, suggesting immediate concern.
severe ailment
Substitutes "illness" with "ailment", indicating a troublesome health problem.
life-threatening disease
Highlights the potential for fatality, emphasizing the extreme risk involved.
debilitating condition
Emphasizes the weakening or disabling effects of the health problem.
major health crisis
Frames the illness as a critical event impacting one's health.
acute health problem
Indicates a sudden and severe health issue requiring prompt attention.
dangerous sickness
Uses "sickness" instead of "illness", emphasizing the hazardous nature of the condition.
severe medical condition
Specifies the illness as a "medical condition", highlighting its nature as a formal health concern.
health emergency
Presents the illness as an urgent and unexpected event endangering health.
FAQs
How can I use "serious illness" in a sentence?
You can use "serious illness" to describe a severe medical condition. For example: "The patient is suffering from a "serious illness" and requires immediate treatment."
What are some alternative phrases for "serious illness"?
Alternatives include "grave sickness", "critical condition", or "severe ailment", depending on the specific context and nuance you want to convey.
Is it appropriate to use "serious illness" in formal writing?
Yes, "serious illness" is appropriate for formal writing, especially in medical, legal, or academic contexts. It's a clear and direct way to describe a significant health issue.
What's the difference between "serious illness" and "chronic disease"?
"Serious illness" describes the severity of a condition, while "chronic disease" refers to a long-lasting or recurring health problem. A chronic disease like diabetes can become a "serious illness" if it's not well-managed.
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
84%
Authority and reliability
4.6/5
Expert rating
Real-world application tested