Q: Over the years I have been bothered by coughing up phlegm from the back of my throat many times a day. One doctor told me it is not infected because the phlegm is white, but didn't really help me ...

When you’re sick, you’ll often produce more phlegm, and might notice it’s thicker or a different colour: white, green, yellow or maybe even brown. What can this phlegm – also called mucus, snot, ...