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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.
Many doctors recommend heat and cold treatments to ease rheumatoid arthritis symptoms. Cold curbs joint swelling and inflammation. You can apply an ice pack to the affected joint during an RA flare-up, for instance. You don't want to overdo cold treatments. Apply the cold compress for 15 minutes at a time with at least a 30-minute break in between treatments.