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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.
It is used to treat rheumatoid arthritis and other forms of inflammatory arthritis and also may be used to treat lupus, inflammatory myositis, vasculitis, and some forms of childhood arthritis. It is often used in combination with other medications to treat arthritis. Methotrexate is one of the most commonly used drugs in the treatment of rheumatoid arthritis. 2  It helps with pain and swelling and also slows the progression of arthritis over time.