A cough that produces mucus, or phlegm, is known as a wet — or productive — cough. Producing mucus while coughing is typically a response to allergens and irritants, airway infections, or an ...

Coughing up white mucus or phlegm can indicate several conditions, including asthma, bronchitis, and chronic obstructive pulmonary disease (COPD). In some cases, a person may need to see a doctor.

Coughing up mucus may be a sign of a respiratory infection or lung issue. The color of the mucus may help inform what’s going on. You may be able to clear mucus at home by staying hydrated, using a ...