Handbook of Disease Burdens and Quality of Life Measures pp 4167-4167 | Cite as
Chronic Obstructive Lung Disease
Any disorder that persistently obstructs bronchial airflow. COLD mainly involves two related diseases – chronic bronchitis and emphysema. Both cause chronic obstruction of air flowing through the airways and in and out of the lungs. The obstruction is generally permanent and progresses (becomes worse) over time.