I switched from coffee to tea (earl grey) in order to cut back on sugar, but instantly I noticed that my heartburn, which had disappeared when I started on primal, reappeared with a vengeance. I'm back to coffee, with reduced sugar, which somehow doesn't spike the burn...
I wouldn't trust online wisdom on what causes and cures heartburn, because a lot of it is CW and wrong - for example peppermint is "supposed to be" soothing and settling for the stomach, however anyone with GERD knows that it's not to be touched with a 10-ft pole because it does the opposite if you have chronic problems.
Basically, experiment with yourself - cut out the tea for a bit, and see if things change. Cut out something else next, and try the tea again. What works for you will be different than for someone else.
28 years old, insurance broker
starting weight 195 lbs (5'4")
working on losing weight, getting active, and curing my GERD