Regular mucus tends to be thin and slippery, and it is generally a constant presence on a day-to-day basis. Meanwhile, phlegm ...

Bronchitis involves inflammation of the bronchial tubes, leading to symptoms like a persistent cough and difficulty clearing mucus. It can be acute, resolving within weeks, or chronic, requiring ...

A head cold happens when the symptoms affect the head, including the nose or throat. A chest cold, or acute bronchitis, happens when the airways swell and mucus builds up in the lungs.