A state of illness, or bad health.
"ill health" is correct and usable in written English. You can use it to refer to physical or mental health problems. For example, "He missed work due to ill health.".
(Ill health was cited).
To bet on ill health?
There were signs of ill health.
In ill health, Farini ruled badly.
He cites ill-health.
There have been reports of ill-health.
He currently lives in Tripoli, reportedly in ill-health.
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Cristina Valenza
Retail Lead Linguist @ Apple Inc.