Good communication will impact clinical practice by assisting patients in understanding health information as well as medical recommendations. Health literacy is important for communication between healthcare professionals and patients with Chronic Obstructive Lung Disease (COPD). In this article we review the concepts, definitions and measurement tools used to evaluate health literacy and recommend ways in which this information may be integrated into clinical practice. Increased awareness of health literacy will assist clinicians to improve patients' knowledge of their disease and adherence to healthcare recommendations.