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A popular myth has grown around the use of WD-40 as a joint lubricant and pain reliever for arthritis. The liquid is sprayed on the painful joint much as one would fix a squeaky mechanical hinge.
Advice on how to use a TENS unit for arthritis: If your arthritic pain is confined to a single region, a TENS unit may help reduce your pain. Just place the electrode pads above and below or parallel to the involved joint. If your arthritic pain is in multiple areas, such as from rheumatoid arthritis, I recommend pad placements in this order.