I have had a cough on and off for 2 years now, doctor tested lung function and sputem sample, all clear. I cough up mucus
contantly, green, yellow, brown
sometimes like spit. When I am run down it is worse and I can have coughing fits for 1-2 hours. This causes a sore throat too.
Doctors put it down that I work in the desert but I am sure there is some underlying problems.