The patient complained of 'sickness' [='nausea'] and stomach pains.
She missed work due to 'sickness'. [='illness']
He died from an unknown 'sickness'.
(..) for as long as we both shall live. Christian, I vow to be your faithful partner in sickness and in health. I promise to love you unconditionally, to honor and respect you, to bring you solace in times of need. (..)2018 Fifty Shades Freed