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

In his latest video dispatch, Ben Ayers explains why climbers and guides frequently catch the dreaded “Khumbu Cough” ...

A chest cold, or acute bronchitis, happens when the airways swell and mucus builds up in the lungs. When this occurs, a person often develops a loose, or chesty cough that typically involves ...