What is bronchitis? Bronchitis is an inflammation of the bronchial tubes that bring air to the lungs. When irritated, they swell, preventing cilia (tiny hairs) from clearing the passages. Mucus builds up, stimulating a reflex to clear them - a cough...
Acute bronchitis
If the cough produces clear mucus, it’s probably viral, so treat the source of the problem first. If the mucus is yellow or green, try: