Compositions and methods for relieving symptoms of rheumatoid arthritis (RA) and related illnesses are disclosed. It appears that the primary cause of RA is a sensitivity or hypersensitivity to potassium and/or vitamin C, or too much potassium and/or vitamin C in the diet. The effects of potassium and vitamin C on the body must be modified to relieve the symptoms of RA and related illnesses. It appears that magnesium does not cause the inflammation, but appears that it exacerbates the problem. It appears that calcium and vitamin D intake, possibly in combination with the reduced or no intake of potassium and/or vitamin C, may also help to relieve the symptoms of RA and related illnesses.