2. Mucus

Another distinctive symptom of COPD is excessive mucous production. The expectoration may be transparent, white, pale green, or yellowish, although yellow or green sputum can also be a sign of an infection in the lungs or airways. People with COPD are at higher risk of developing lung infections. In some cases, this sign does not develop until the condition has progressed. The mucus causes congestion and can result in breathing difficulties, primarily upon waking. Mucous production tends to get worse as the disease advances.


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