maladie
Illness starts and ends in the head.
La maladie commence et finit dans la tête.
— The Barbarian Invasions (2003)
Mary continued to work in spite of her illness.
Malgré sa maladie, Mary a continué à travailler.
She couldn't come because of an illness.
Elle n’a pas pu venir à cause d’une maladie.
He couldn't come on account of his illness.
Il n’a pas pu venir à cause de sa maladie.
Illness forced him to give up school.
La maladie l’a contraint à abandonner l’école.
His absence was due to illness.
Son absence était due à une maladie.