Deb, pre and post op, most doctors advise to cut out all caffeinated coffee and tea. Because it's so hard to get in all the liquids your body needs right after surgery, and coffee and tea (anything caffeinated) act as diuretics, and rob water from your body tissues, it's best to abstain. Once you're past the point of being able to get in all your fluids, I don't think a cup or two a day of coffee or tea will hurt you, but remember, it still acts as a diuretic, so you should drink a little more water than the recommended 64 ozs. per day.