I just have to mention this. I used to drink green tea, and had real problems with it tearing up on my stomach. I tried black tea for a while and wasn't really thrilled, but at least it was easy on my stomach. Then a friend introduced me to oolongs. I drink way more oolong tea than I used to drink green, and I have absolutely no stomach issues from it. Not to mention the taste has really grown on me, now I prefer it more than any other tea.