Tiānqì yī biàn, tā de guānjiéyán jiù jiù bìng fù fā.
Whenever the weather changes, her arthritis flares up again.
Tips
history
Attested in 《三国演义》 chapter 32: Yuan Shao hears of his son's defeat, '旧病复发,吐血数斗' — his old illness relapsed and he vomited blood. Used for literal illness and figurative bad habits.
usage
Works for real illnesses (cancer, arthritis) and for recurring bad behaviors (drinking, gambling).