If (the back panels of) your kitchen and bathroom cupboards are affected, and (even worse) the house still has no metal frame but wood beams carrying the plafond gypsum panels, very often the only thing to do is to replace all that wood. Esp. if the house is more than 15 years old, then it really is too late. And that will cost you.
It is a safety hazard; I had the (relatively new, 3 years only) cupboards falling of the wall. And imagine a drywall ceiling panel coming down in a bedroom. Very often they say the (ply)wood that the carpenters buy is treated, but to save money....