In PMR, IL−6 levels are high. Given that both RA and PMR have the same variation of symptoms (worse in the morning); it's likely that PMR patients have the same variation in IL−6 levels. In a pilot study of 4 patients conducted within our department, IL−6 levels did, indeed, show a pattern similar to that found in RA patients, but the number of patients is small and the results need to be confirmed.