When you drink or eat something that is too processed, there is a lack of minerals, so the mucous membranes in the throat are slightly damaged. And then air/gas comes from the stomach, that's what makes it sting. What helps then is swallowing a little toothpaste, for example, or cultured-milk, so that the mucous membranes get minerals again. Doctors don't even know this, they think it's just acid reflux that does it, from the stomach. Some bread, for example, that lacks minerals, causes it, and some drinks, like beer for example, some of them. It`s a normal problem, is some countries, that don`t make more healthy foods. I`m not talking about fast-food like hamburgers normally, but frozen food, for example, that lacks minerals.