What causes a rheumatoid arthritis flare?

Several factors: Stress one frequently reported factor in rheumatoid arthritis flare-ups is stress.Some foods can trigger arthritis flare-ups. Among these, cow's milk is the most often cited, but shrimp, wheat and some meats, hen's eggs and codfish also are implicated. Echinacea echinacea has been cited as a possible cause of flare-ups in those with rheumatoid arthritis, .

Stress, medication c: Stress, medication changes and interactions, infection.