Q. Why do you not recommend WD-40 for arthritis? I know a couple of older gentlemen who have used it and say it works.
A. We too have heard from folks who have used WD-40, the mechanics’ lubricant for squeaky hinges and sticky mechanisms, on their own stiff joints. We worry that people will spray it on the sore spots and inhale it accidentally. Inhaling WD-40 can lead to lung inflammation (chemical pneumonitis) that can be debilitating and difficult to treat.