Juice Phlegm Why Does Your Throat Fill With Phlegm After Drinking Lemonade Or Cranberry Juice, Ect?

Why does your throat fill with phlegm after drinking lemonade or cranberry juice, ect? - juice phlegm

I think it's the sugar that does this. This can occur with sugar, orange juice, etc., but the acid is also likely. (Grapefruit juice, for example). I found apple juice to avoid that effect, or prune juice, but not grape juice.