My cough getting worse and worse.?

A week ago i started to get a tickle in my throat and it signaled me that i was about to get a sore throat. I ignored it and ate alot of fried foods and made it worse. Now i have a bad cough. I cough up phlegm yellow/green, and brown. It doesn't seem like i'm sick because my nose is not stuffy and i do not have a fever. What's wrong? Should i be concerned?