Is it possible to get rid of phlegm?

Because i have tried countless methods to get rid of it once and for all but nothing works. The more i hack up and spit out, the more it comes back. It seems endless. Is there any way to get rid of it or do you just have to wait till you get older. Because it's really annoying and i want to get rid of it. Whenever i eat the food gets stuck and it makes it hard to swallow.