Hi, I'm A Healthy Young Female. I Have Been Experiencing

Hi, I'm a healthy young female. I have been experiencing a burning sensation down what i'm pretty sure is my trachea and branches out into my chest/lungs. It is inconsistent and occasionally accompanied with coughing, phlegm and mild nausea. It is most prominent after physical activity, like jogging, but i've always been fairly active. I've been jogging outdoors for a few years now and it's only recently been a problem. Especially in colder weather. I don't have any known allergies, asthma or other health conditions, nor do I smoke or take medication (outside of an occasional multivitamin). Should I be concerned?