I have just started an exercise program at my local gym. I use an elliptical or stair-step machine for 30 minutes, and then I swim very low-paced laps for 30 minutes. Once I get breathing hard, I start coughing up phlegm that seems to come back as soon as I get rid of it. It lasts several hours after I'm done exercising, and this has happened for as long as I can remember. I don't smoke, I don't have allergies, and I tested negative for asthma(and this is a wet cough anyway). I have had both pneumonia and bronchitis before, and the cough is very similar to those. It does go away after a while, but is very irritating. Can anyone give me some advice?View Thread