Fish oil can be used to treat rheumatoid arthritis symptoms because of its omega-3 fatty acids. These acids block inflammation by being converted into resolvins, powerful anti-inflammatory chemicals, in the body. In addition to inflammation, fish oils can also help with morning stiffness.
Fish oil can be found in the form of capsules, soft gels, chewable tablets, and liquids. Pregnant women should limit fish intake to avoid consuming excess mercury.