The patient complained of 'sickness' [='nausea'] and stomach pains.
She missed work due to 'sickness'. [='illness']
He died from an unknown 'sickness'.
(..) Shall we? - Some grape juice? - I'd love it. Ah, so many pills. How sick are you? The sickness has become a relative term for me. I think of it now as more a general wearing out process. To you. So what happened? (..)2004 The Notebook