What Causes A Runny Nose When You Have A Cold?

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Introduction


Upper respiratory tract infections affect the air passages in the nose, ears, and throat.

Structures of the throat include the esophagus, trachea, epiglottis, and tonsils.

Structures of the throat include the esophagus, trachea, epiglottis, and tonsils.

The infections can be caused by viruses, bacteria, or other microscopic organisms. In most cases, these infections lead to colds or mild influenza (flu) and are temporary and harmless. In rare cases, flu can be severe, or the infections...

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