In more in-depth terms, the Global Initiative for Obstructive Lung Disease (GOLD) defines a COPD exacerbation as a period in the natural course of the disease that is characterized by a worsening of your baseline symptoms -- such as dyspnea, cough and/or sputum production. This change may well warrant a check-in with the doctor and a modification in your current medication regimen.
The two primary causes of COPD exacerbation are lung infections and air pollution, but sometimes the cause is unknown.
Read What is a COPD Exacerbation? to learn more about causes, signs and symptoms, treatment and prevention.

