Gold stages (COPD staging)

The GOLD stages classify Chronic Obstructive Pulmonary Disease (COPD) based on the severity of airflow limitation and symptoms. There are four stages: 1. **GOLD 1**: Mild COPD; slight limitation, often not noticeable. 2. **GOLD 2**: Moderate COPD; more noticeable breathlessness, especially during physical activities. 3. **GOLD 3**: Severe COPD; significant limitation and increased shortness of breath, even with minimal exertion. 4. **GOLD 4**: Very severe COPD; severe limitations, frequent exacerbations, and potential respiratory failure. These stages help guide treatment and management to improve quality of life for those affected.