In this final paper, the chronic obstructive pulmonary disease, the causes of the same disease, prevalence, treatment, and its representation in Zadar County will be written. "COPD refers to structural changes in the respiratory tract and pulmonary parenchyma that result in inflammation resulting in narrowing of the airways and the disabling of undisturbed air passage through them. Reduced air flow is most often progressive and associated with an inappropriate inflammatory response to the lungs to some harmful ingredients or gases, especially tobacco smoke. "6 "COPD combines chronic obstructive bronchitis and lung emphysema."7 "Chronic obstructive bronchitis is manifested by a permanent cough that creates a stroke and is not caused by other lungs or heart causes causes a productive cough that lasts for at least three months in two consecutive years."8 Emphysema of the lungs is the growth of small bags (alveoli) and the reduction of the pulmonary tissue that lies between them. This time, the lungs become less elastic, which leads to increased air space and difficult breathing. "9 " COPD is a progressive disease, it develops and progresses, and is manifested by productive coughing and dyspnea. Further progression of the disease, symptoms are exacerbated, exacerbation occurs, which implies a worsening of the patient's symptoms and overall clinical condition. " " In COPD, the goal of treatment is to prevent exacerbation and achieve long-lasting lung function improvement by using appropriate medications. "10