The London COPD Exacerbation Cohort

This study is following patients with COPD (chronic obstructive pulmonary disease — a progressive lung condition that makes breathing increasingly difficult) over time to understand what triggers flare-ups, how the body responds, and what helps recovery. **You may be eligible if...** - You have COPD confirmed by a breathing test showing reduced airflow (FEV1/FVC ratio below 0.70) - You are willing to give written consent - You are 40 years or older **You may NOT be eligible if...** - You have a history of asthma, bronchiectasis (widened airways), lung cancer, or another significant lung condition - You take immunosuppressive medications or have active cancer - You are on long-term oral steroid therapy - You are under 40 years old Talk to your doctor to see if this trial is right for you.