Emphysema
Read Your Scan Editorial Team·Last updated
Written from published radiology references and reviewed for plain language. Not written or signed by a physician, and not a diagnosis. How we write these pages →
In plain language
Areas where the tiny air sacs of the lung are enlarged or damaged, often linked to smoking. Reports may describe it as mild, moderate, or severe. It describes lung structure and is interpreted alongside your breathing and history.
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Where you'll see this
This wording turns up on Chest CT reports — CT imaging of the chest. A chest CT gives a much more detailed view than a regular chest X-ray. It shows the lungs and airways, the space between the lungs (the mediastinum), lymph nodes, blood vessels, the heart’s outline, and the chest wall. Doctors order it to look more closely at a cough, shortness of breath, an abnormal X-ray, a known nodule, an infection, or to check blood vessels. Seeing something on the images does not by itself mean something is wrong — your doctor reads the pictures together with your history and other tests.
Questions worth asking your doctor
- What was the main reason this chest CT was ordered, and did it answer that question?
- Were any findings unexpected, and do any of them need follow-up?
- If a nodule was seen, does it need another scan later, and when?
- Do the results change anything about my current treatment or medications?
- Is there anything in my history that helps explain what the report describes?
How common is this?
Emphysema is a very common finding on chest CT, particularly in current or former smokers, and its prevalence increases with age and cumulative smoking history. Mild changes can be seen in a meaningful share of older adults, even some never-smokers, as part of normal lung aging, but clinically significant emphysema is overwhelmingly associated with tobacco use.
When should I worry?
Mild or trace emphysema noted incidentally may have no impact on breathing or daily life at all. More advanced or widespread emphysema, especially if you are experiencing increasing shortness of breath, reduced exercise tolerance, or frequent respiratory infections, warrants a conversation with your doctor about pulmonary function testing and treatment options.
What happens next
Smoking cessation is the single most important step for anyone with emphysema who still smokes, as it is the only intervention proven to slow progression. Treatment may also include inhalers, pulmonary rehabilitation, vaccinations against pneumonia and influenza, and in advanced cases, supplemental oxygen or surgical options.
Frequently asked questions
- Does emphysema mean I have COPD?
- Emphysema is one component of COPD, the other being chronic bronchitis. Having emphysema on imaging doesn't automatically mean you have clinically significant COPD; that diagnosis also depends on pulmonary function tests and your symptoms.
- Can emphysema damage be reversed?
- The lung tissue destruction in emphysema is generally permanent, but stopping smoking prevents further damage and the remaining healthy lung tissue often compensates well. Treatment focuses on maximizing the function of the lungs you have rather than reversing the changes.
- I never smoked — why do I have emphysema?
- While smoking is by far the most common cause, emphysema can also result from long-term exposure to air pollution, occupational dust and fumes, a rare genetic condition called alpha-1 antitrypsin deficiency, or simply from aging. Your doctor may check for these alternative causes.
Other words on the same report
Where this word comes up
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Read Your Scan is informational only — not a medical diagnosis, and not a substitute for a licensed radiologist or your doctor. If you have urgent symptoms, seek care.