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An acute exacerbation of chronic obstructive pulmonary disease, or acute exacerbations of chronic bronchitis (AECB), is a sudden worsening of chronic obstructive pulmonary disease (COPD) symptoms including shortness of breath, quantity and color of phlegm that typically lasts for several days. Exacerbations can be classified as mild, moderate, and severe. As COPD progresses, exacerbations tend to become more frequent, the average being about three episodes per year.