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The phrase "a sudden illness" is correct and usable in written English.
It can be used when describing an unexpected health issue that arises quickly and without warning.
Example: "She had to cancel her plans due to a sudden illness that left her unable to attend the event."
Alternatives: "an unexpected illness" or "a rapid onset illness."
Exact(60)
"A Sudden Illness" by Laura Hillenbrand, July 7, 2003.
Passed away following a sudden illness on November 19th.
56, on May 10, 2000, after a courageous battle with a sudden illness.
Then a sudden illness made me more interested in population health.
Keenan recorded vocals for the LP before contracting a sudden illness in late December.
Just after Slingo was appointed the post, a sudden illness claimed the life of her husband.
POPE--Joseph D., age 54, on February 28 , 2005 following a sudden illness.
After a sudden illness he renounced secular pursuits in fulfillment of a vow.
A Russian opposition activist has been taken to hospital in Moscow after a sudden illness.
A resident of Woodbridge, NJ, passed away November 3, after a sudden illness.
A tweet by his club, Fiorentina, made reference to an "improvviso malore" – best translated as a "sudden illness".
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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