Thanks for writing aglove. I can't speak to blood thinners and increased RA symptoms, but there are some potential medication interactions to be aware of. Biologics are know to affect the way warfarin is metabolized, thus dosages may need to be adjusted. In addition, most NSAIDs used for RA can injure the stomach and GI tract and thus can pose problems with blood thinners. Hopefully others can offer up experiences about the effects on symptoms. Best, Richard (RheumatoidArthritis.net Team)