Coughing is a common symptom of many different illnesses. Determining the cause of your cough is the best way to treat it. However, a productive cough can be caused by many different types of infections. If you’re coughing up mucus, you may be suffering from a respiratory tract infection. Keep reading to learn how to treat a productive cough and common causes of a cough that produces mucus. For same-day illness symptom treatment, walk ...