Treating and managing COPD becomes much more difficult in stage 3. A pulmonary rehab program becomes a necessity, and it is vital to focus on exercising and maintaining a healthy diet. Doctors may perform frequent checkups to measure pulmonary function.
Though physicians may use supplemental oxygen at any stage of COPD, they most commonly begin using it in stage 3. Steroid inhalers are often necessary to decrease inflammation in the lungs.

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