Women who consume large amounts of tea have an increased risk of developing rheumatoid arthritis (RA). Mind you, key word there is LARGE amounts of tea, so don't panic. Yet. In case you don't know, RA is an autoimmune disorder where one's own immune system attacks the tissue arounds the joints. The study, however, does not see the same correlation with coffee consumption. Good news for male coffee drinkers, I guess - they're at risk for disorders other than RA.
Like, maybe insomnia.