>I like oolong but have noticed that it gives me a stomach ache, I am not
>sure why. I've just noticed it recently.

Wulong is relatively strong, especially the Taiwan teas like A Li Shan.
Try eating some crackers or some cookies before drinking the tea, and
it will probably help the pain. I also noticed that I would get a
stomach ache occasionally, but it was only when I didn't have something
on my stomach.