Coughing up mucus can be a sign of various underlying conditions, ranging from mild to severe. While occasional mucus production is normal and helps keep your airways moist and clear, persistent, discolored or excessive mucus may indicate a more serious issue. Conditions like bronchitis, pneumonia, or even chronic illnesses could be at play. If you are coughing up mucus, you should seek medical care for a diagnosis and treatment. At AFC Urgent Care Waltham, we ...