Coughing Up Grayish Green Phlegm
Coughing up grayish green phlegm can be a concerning symptom that often indicates an underlying respiratory issue. Phlegm, also called sputum, is a thick mucus produced by the lungs and respiratory tract to trap and eliminate irritants, bacteria, or viruses. While clear or white phlegm is common during minor colds, grayish green phlegm may signal … Read more