Chronic pain is defined as pain that persists beyond acute pain, typically over six months. It can be initiated with an injury or disease, but may persist after the triggering injury has healed.

Chronic bronchitis and emphysema are types of COPD. In 2018, about 16.4 million people in the United States reported a diagnosis of any type of COPD. Risk factors and prevention.

DEFINITION OF CHRONIC OBSTRUCTIVE PULMONARY DISEASE. The American Thoracic Society (ATS) defines COPD as a “disease state characterised by the presence of airflow obstruction due to chronic bronchitis ...

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