COPD is a lung disease that makes breathing difficult over time. It includes chronic bronchitis and emphysema. With chronic bronchitis, the breathing tubes become inflamed and produce excess mucus. With emphysema, air sacs in the lungs are damaged causing shortness of breath. Symptoms include coughing, sputum production, wheezing, and difficulty breathing. COPD is detected through spirometry, chest x-rays, and medical history. Quitting smoking, avoiding secondhand smoke, and protecting oneself from chemicals and dust can prevent COPD. Treatment includes quitting smoking, using inhalers, oxygen therapy, pulmonary rehabilitation, and possibly surgery for severe cases.