Yes but it could also be a cold!
Mucus naturally occurs. As it is sticky, it is there to trap airborne particles before they get to the lungs. To expel mucus, for example, by coughing, is quite normal.
Mucus
Coughing is the best way to remove mucus from the sputum, though there are over the counter medicines to help rid of mucus.
because some labs have a retaining mucus cell that may produce mucus in there older years
It is collected in Mucus and expelled through coughing.
yes..what is it
Coughing do not filters the air. Particles from air are deposited on mucus membrane of bronchial tree. But coughing takes out the particles deposited there.
Ejecting phlegm or mucus from the throat or lungs, by coughing.
When your dog or cat or horse coughs up mucous; this means they have been "hyperventilating; hyperventilating is during hot weather the animal "breathes with the tongue hanging out...what happens is: when your dog "hyperventilates...mucous begins to collect @ the back of the dog's throat; so your dog "coughs up this mucous; if your dog or cat cannot cough up the mucus; then open the dog's mouth and scrape the mucous out of the dog's mouth with your fingers; then wash your hands...
hypoxia
They help to expel the viruses caught in the respiratory mucus.
i would visit the doctor