Physicians I have known have learned not to laugh at the broad spectrum of home remedies that their patients claim to relieve pain. Physicians have learned that if something works and if it does no other harm, then why not continue using it?

I am not now nor have I ever been a doctor, but I worked in hospitals long enough to hear this remedy many, many times:

Rub WD40 into the skin over a painful joint.

Before the invention of WD40, country folks would rub the areas with potato slices.