Emphysema is a lung disease that makes it difficult to breathe. Besides, the condition has several stages, such as mild, moderate and severe stages.
To figure out the severity of the disease, a patient needs to have a test: forced expiratory volume in 1 second (FEV1), which can examine lung function.
According to Global Initiative for Chronic Obstructive Lung Disease staging system, if the result is 80% or more than 80%, it means mild emphysema.
Key word: mild emphysema