How Do I Deal With This Mucus Secretion?

Question

I have always had a problem of excessive mucus secretion when I do my workouts throughout my life. I experience this even after a minor task like carrying something up the stairs, walking briskly and so on. I find that I constantly need to spit out my mucus while I am working out and this is a real nuisance. I am about ten to twenty pounds overweight but I started experiencing this problem even before I gained this extra weight. I find that my problem disappears very soon after I finish exercising. I know that this is not really an exercise-induced asthma but I am not really certain about it. I am also a victim of sinus problems and I thought that this complication was associated with this .I would be very grateful if someone could shed some light on this matter and clear my quandary for me as soon as possible as I am really getting quite desperate with this problem now.