Chronic obstructive pulmonary disease is a chronic disease in which health status can be measured with both generic and disease-specific questionnaires. These tools are able to evaluate improvements in daily functioning owing to various therapeutic methods and, despite a rather poor correlation with lung function, are able to correlate to the disease severity. In chronic obstructive pulmonary disease, this correlation between health status and disease severity has been demonstrated in many studies and the analysis discussed in this article adds further similar information in support of this statement.