Chronic obstructive pulmonary disease (COPD) is a disease in your windpipe, it occurs when your windpipe gets obstructed or narrowed down by some of your lung-related problems. Many conditions may cause COPD in you, such as you may have chronic bronchitis: When the inner layer of your lung tree and its branches (bronchi) are irritated by an infection or another external cause, such as smoking or just, your lung will release an amount of mucus (thin jelly-like oily substances), and that may block your windpipe (trachea). You may have emphysema: When small lung spaces look like bee-hive (lung alveoli) have a problem. The lung alveoli have a role in passing your filtered blood with a good amount of oxygen to distribute into your entire body, which is pumped out by your healthy heart. If you are suffering from emphysema, and your lung alveoli cannot continue that job sufficiently, then you are in trouble. This may lead to COPD. The educational leaflet may help you determine what you need to do when suffering from COPD. You may have chronic asthma: Sometimes you may experience permanent obstacles in your windpipe due to repeated asthma, and you are suffering for quite a long time. Therefore, if any of the above conditions in your lungs are detected as COPD, this leaflet will help you.