Cough
A cough is a protective reflex, not a disease in itself. Its duration is what matters: a cough lasting a few days usually follows a viral infection, while one that goes on for more than three weeks needs investigating on its own.
Which specialists treat this
When to see a doctor without delay
See a doctor without delay if the cough comes with shortness of breath, chest pain, blood in the sputum, high fever, or if it lasts more than three weeks alongside weight loss.