Lung Health • Learn
What Is COPD?
COPD, or chronic obstructive pulmonary disease, is a long-term lung disease that makes it harder to move air in and out of the lungs. It can cause shortness of breath, chronic cough, wheezing, mucus, and reduced activity tolerance.
Also called chronic obstructive lung disease, chronic bronchitis, emphysema, airflow obstruction, chronic cough, wheezing, low oxygen levels, or pulmonary rehabilitation.
Plain English
COPD is a chronic lung condition where airflow becomes limited. The airways may become narrowed, inflamed, swollen, or filled with mucus, and the tiny air sacs in the lungs may become damaged. COPD commonly includes chronic bronchitis (airway inflammation and mucus) and emphysema (damage to the air sacs).
Why it matters
COPD can make daily activities harder and increase the risk of flare-ups, respiratory infections, low oxygen levels, hospitalizations, fatigue, and reduced quality of life.
Key numbers and tests
Important tests include spirometry, FEV1, FVC, FEV1/FVC ratio, oxygen saturation (SpO2), 6-minute walk test, chest X-ray, CT scan, arterial blood gas, and alpha-1 antitrypsin testing when inherited risk is suspected.
Symptoms
Common symptoms include shortness of breath, chronic cough, mucus or phlegm, wheezing, chest tightness, fatigue, and frequent respiratory infections. Urgent symptoms include sudden worsening shortness of breath, change in mucus, fever, chest pain, blue lips or fingernails, confusion, fainting, or oxygen below your clinician’s range.
How it can progress
Lung irritation and inflammation can lead to chronic cough and mucus, then airflow limitation, flare-ups with reduced activity, and in advanced disease low oxygen levels, weight loss, muscle weakness, pulmonary hypertension, or hospitalizations.
Outlook
COPD is usually long-term and not fully reversible, but it can often be managed. Quitting smoking, avoiding irritants, inhalers, vaccines, pulmonary rehabilitation, and oxygen therapy when needed can reduce symptoms, prevent flare-ups, and improve daily life.
How diet and exercise help
Adequate protein, nutrient-dense foods, smaller meals when needed, hydration if appropriate, healthy weight, and safe activity — ideally with pulmonary rehabilitation when recommended — can support breathing, strength, and endurance.
Metrics to monitor
Home metrics include shortness of breath, cough, mucus, wheezing, oxygen saturation when recommended, activity tolerance, flare-ups, inhaler use, smoking status, weight, sleep, and vaccinations. Report-based metrics include spirometry, FEV1, FVC, FEV1/FVC ratio, GOLD stage, oxygen readings, 6-minute walk test, chest X-ray, CT scan, pulmonary function tests, arterial blood gas, alpha-1 antitrypsin, blood count, and inhaler or oxygen therapy notes.
Common questions
What is COPD?
COPD, or chronic obstructive pulmonary disease, is a long-term lung disease that limits airflow into and out of the lungs and can cause shortness of breath, cough, mucus, wheezing, and reduced activity tolerance.
Is COPD the same as emphysema?
Emphysema is one condition included under COPD. COPD can also include chronic bronchitis. Some people have features of both.
Can COPD happen if I never smoked?
Yes. Smoking is a major cause, but COPD can also occur in people who never smoked due to secondhand smoke, pollution, workplace dust or fumes, and genetic factors.
Can COPD be cured?
COPD is usually a long-term condition and is not fully reversible, but treatment can reduce symptoms, improve quality of life, and reduce flare-ups.