As any doctor will tell you, there are coughs–and then there are coughs! All coughs, though, are a response by your body to rid itself of something that wants to get out. This could be infected mucus in your lungs or the piece of popcorn that “went down the wrong tube.” Basically this means you don’t always want to interfere with the process. You feel the first type of cough, called bronchitic, deep in your chest. For these coughs, you need an expectorant to help the lungs bring up phlegm, to be “productive,” as doctors say.