Someone with stage 3 COPD experiences significantly worse symptoms, often with more frequent exacerbations. Their cough becomes more intense, and shortness of breath is extremely common.
Some people have headaches, especially after waking up. Their lips or nail beds may turn blue from lack of oxygen. Swelling may occur in the feet, ankles, and legs. To qualify for stage 3, the FEV1 value must fall between 30 and 49 percent.

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