“I’m just out of shape.” “It’s only a smoker’s cough.” Those are two of the most common things people say before a COPD diagnosis. COPD is common and often underdiagnosed, and the earlier it’s caught, the more can be done. Here is how a clinician thinks it through.
What Is COPD?
Chronic obstructive pulmonary disease (COPD) is a lung condition with chronic respiratory symptoms caused by airway abnormalities (chronic bronchitis, bronchiolitis) and/or alveolar destruction (emphysema). The result is persistent, often progressive airflow obstruction.
| Chronic bronchitis | Emphysema | |
|---|---|---|
| What’s happening | Inflamed, mucus-producing airways | Destruction of alveoli |
| Typical features | Chronic cough, sputum | Gas exchange impairment, breathlessness |
Most patients have a mix of both.
Who Gets It?
- Smoking is the leading cause, including past smoking.
- Other exposures: biomass fuel smoke, occupational dusts and chemicals, air pollution
- Alpha-1 antitrypsin deficiency (AATD): think of it with early-onset emphysema (before about 45), a family history, or emphysema at the lung bases
- A history of asthma, severe childhood respiratory infections, or premature birth can also contribute
Note that not everyone with COPD is a smoker, so don’t rule it out based on smoking history alone.
Step One: Symptoms
Think COPD in anyone with risk factors and:
- Progressive shortness of breath (worse with exertion)
- Chronic cough, with or without sputum
- Wheezing or chest tightness
- Frequent chest infections
Step Two: Spirometry Confirms It
Symptoms alone can’t make the diagnosis. The test that does is spirometry.
- Post-bronchodilator FEV1/FVC < 0.70 confirms persistent airflow obstruction.
- Unlike asthma, the obstruction is not fully reversible.
- Chest X-ray doesn’t diagnose COPD, but it helps rule out other conditions.
Step Three: Grade the Severity
The GOLD grade is based on how much lung function remains (FEV1 as a percent of predicted):
| GOLD grade | Severity | FEV1 |
|---|---|---|
| 1 | Mild | 80% or higher |
| 2 | Moderate | 50 to 79% |
| 3 | Severe | 30 to 49% |
| 4 | Very severe | Below 30% |
But the grade alone doesn’t decide treatment. For that we use the ABE groups.
Step Four: Choose a Group (ABE)
The GOLD ABE framework looks at symptoms (mMRC or CAT score) and exacerbation history.
| Group | Who | Initial treatment |
|---|---|---|
| A | Few symptoms, low exacerbation risk | A bronchodilator (short- or long-acting) |
| B | More symptoms, low exacerbation risk | LABA + LAMA |
| E | High exacerbation risk, regardless of symptoms | LABA + LAMA; consider adding an ICS if blood eosinophils are 300 cells/µL or higher |
Group E means 2 or more moderate exacerbations, or at least 1 exacerbation leading to hospitalization, in the past year.
Inhaled corticosteroids (ICS) carry a higher risk of pneumonia, so they’re used selectively, usually guided by eosinophil counts and exacerbation history.
What Helps Most (Beyond Inhalers)
- Smoking cessation: the single most effective way to slow lung function decline
- Pulmonary rehabilitation: improves breathlessness, exercise capacity, and quality of life
- Vaccines: influenza, pneumococcal, COVID-19, RSV, and Tdap
- Inhaler technique: many patients use inhalers incorrectly, so ask your clinician or pharmacist to watch you
- Long-term oxygen in patients with severe resting hypoxemia (generally SpO2 of 88% or lower, or PaO2 of 55 mmHg or lower)
- Selected patients may qualify for additional options, such as other add-on medications, non-invasive ventilation, or lung volume reduction
Exacerbations: Know the Warning Signs
An exacerbation is a flare of worsening breathlessness, cough, or sputum. Typical treatment includes:
- Short-acting bronchodilators
- A short course of oral corticosteroids (commonly prednisone 40 mg for 5 days)
- Antibiotics when sputum becomes more purulent along with increased breathlessness or sputum volume
- Hospital care, and sometimes non-invasive ventilation, for severe cases
When oxygen is needed during a flare, the target SpO2 is generally 88 to 92%. Too much oxygen can worsen CO2 retention in some patients.
When to Seek Urgent Care
- Severe breathlessness not relieved by your rescue inhaler
- Trouble speaking in full sentences
- Blue or gray lips or fingertips
- New confusion or unusual drowsiness
- Fever with a marked increase in sputum
Key Takeaways
- COPD is confirmed by post-bronchodilator spirometry (FEV1/FVC below 0.70), not by symptoms alone.
- Grade (1 to 4) tells you how severe the airflow limitation is; group (A, B, E) guides treatment.
- Start with a bronchodilator (A), or LABA + LAMA (B and E), and consider ICS in selected patients.
- Quitting smoking, vaccines, and pulmonary rehab matter as much as any inhaler.
- A chronic cough or unexplained breathlessness deserves a spirometry test, even if you “feel fine.
References
Global Initiative for Chronic Obstructive Lung Disease. (2025). Global strategy for the diagnosis, management, and prevention of chronic obstructive pulmonary disease (2026 report). https://goldcopd.org/2026-gold-report-and-pocket-guide/
Graham, B. L., Steenbruggen, I., Miller, M. R., Barjaktarevic, I. Z., Cooper, B. G., Hall, G. L., Hallstrand, T. S., Kaminsky, D. A., McCarthy, K., McCormack, M. C., Oropez, C. E., Rosenfeld, M., Stanojevic, S., Swanney, M. P., & Thompson, B. R. (2019). Standardization of spirometry 2019 update: An official American Thoracic Society and European Respiratory Society technical statement. American Journal of Respiratory and Critical Care Medicine, 200(8), e70-e88. https://doi.org/10.1164/rccm.201908-1590ST
O’Driscoll, B. R., Howard, L. S., Earis, J., & Mak, V. (2017). BTS guideline for oxygen use in adults in healthcare and emergency settings. Thorax, 72(Suppl 1), ii1-ii90. https://www.brit-thoracic.org.uk/quality-improvement/guidelines/emergency-oxygen/
Sandhaus, R. A., Turino, G., Brantly, M. L., Campos, M., Cross, C. E., Goodman, K., Hogarth, D. K., Knight, S. L., Stocks, J. M., Stoller, J. K., Strange, C., & Teckman, J. (2016). The diagnosis and management of alpha-1 antitrypsin deficiency in the adult. Chronic Obstructive Pulmonary Diseases, 3(3), 668-682. https://pmc.ncbi.nlm.nih.gov/articles/PMC5556762
**This post is for general education and doesn’t replace individualized medical advice. Guidelines are updated regularly, so always confirm with your healthcare provider.