Which is one of the earliest signs of Chronic Obstructive Pulmonary Disease (COPD)?

One of the earliest signs of Chronic Obstructive Pulmonary Disease (COPD) is a decline in the ability to exercise. This symptom arises because as COPD progresses, the lungs' ability to efficiently exchange oxygen and remove carbon dioxide diminishes. Individuals often notice that they become easily fatigued or short of breath with activities they previously managed without difficulty, indicating reduced exercise tolerance.

While other options like dyspnea (shortness of breath) during minimal exertion, abnormal pulmonary function tests, and a productive cough are indeed associated with COPD, they typically present after the initial decline in exercise capacity. Exercise intolerance can serve as an initial red flag that prompts individuals to seek medical attention and undergo further evaluation for respiratory issues. This progression underscores the importance of recognizing early signs to manage the disease effectively.