I AM NOT A DOCTOR! (Well not that kind of doctor.)  I love tea, I love what it does for my life, but caffeine is a drug and depending on what the tea is blended with or even how the tea itself was prepared (looking at you pu'er tea) they can have potent effects on the human body.  If you have any specific health related questions ("I heard [XXXX] is good for blood pressure?") please take those questions to a licensed medical doctor and then by all means, if you feel comfortable, pass that information along to me. Having said that, if you got a scratchy throat I'd be happy to recommend some hot peppermint tea with a touch of local Michigan honey.