Ok, I'm a Male 19 year old and last month I a cough not very bad mostly during the mornings and when I was in the shower from the steam. I have not coughed since then though. However, I did hack up some green phlegm this morning. Also, I have some noise in my chest on my left side when I inhale. What could this be? I guessing not cancer since I have not had any other symptoms, but I just wanted to get an expert's opinion.