A persistent cough can be a sign of a more serious illness, which is why it's important to get it checked by a doctor.

It is also called an unproductive cough since it does not produce phlegm ... The COVID-19 infection inflames your lung ...

An unproductive, or dry cough ... discolored lips or face, and trouble breathing. Coughing is the body's way of clearing an infection, but a chronic cough can be due to inflammation.