Just tea or caffeine in general??

[cavemma]

So for my whole30, I also decided to cut coffee out. I have had small amounts of green and black tea and I think that I have been getting hives from it. I used to drink green tea every morning without an issue but the last few times I've had caffeinated teas (I'm fine with herbal teas) I notice that I'm itchy or jittery. Has anyone else had this issue? And do you think its tea or caffeine in general? I'll wait until I'm done to test coffee, but I was curious because this is something I've never noticed before. Thanks.