Chronic Obstructive pulmonary disease (COPD) is the name for a group of lung conditions that cause breathing difficulties .It includes emphysema - damage to the air sacs in the lungs, chronic bronchitis - long term inflammation of the airways
COPD is a common condition that mainly affects middle aged or older adults who smoke .The breathing problems tend to get worse over time and can limit activities ,although treatment can help to keep the condition under control
https://www.nhs.uk/conditions/chronic-obstructive-pulmonary-disease-copd/