Chronic obstructive pulmonary disease is long-term narrowing of the airways that does not fully open back up. That last part is what separates it from asthma, where the narrowing largely reverses. The distinction matters because it changes what treatment is trying to achieve.
How COPD is actually diagnosed
Not by symptoms, and not by a chest X-ray. It is diagnosed with spirometry, a breathing test where you blow as hard and as long as you can into a tube.
The number that decides it is the ratio between how much air you can force out in the first second (FEV1) and the total you can force out (FVC). If that ratio stays below 0.70 after you have been given a bronchodilator, the airway obstruction is not fully reversible, and that meets the definition of COPD.
This is why a diagnosis made on symptoms alone is worth questioning. Breathlessness and a long-standing cough have a long differential — heart failure, deconditioning, anaemia and asthma all produce them. Several of those are treated in completely different directions.
What the inhalers are for
Patients are often handed two or three inhalers with no explanation of why they differ, then judged for not using them properly. They do different jobs.
A short-acting bronchodilator is the rescue inhaler. It relaxes airway muscle within minutes and wears off within hours. It is for when you are short of breath now.
Long-acting bronchodilators — the LAMA and LABA classes — are the maintenance inhalers. They are taken on a schedule whether or not you feel bad that day, and their job is to keep the baseline better and reduce how often you flare.
Inhaled corticosteroids are added for a narrower group, usually people who keep having flare-ups despite the bronchodilators, or who have a raised blood eosinophil count. They are not a default. In COPD, unlike asthma, adding an inhaled steroid carries a real pneumonia risk, so it should be a considered decision rather than a reflex.
None of these reverse the underlying narrowing. They reduce symptoms and lower the flare-up rate, which are worth having on their own terms.
The one thing that changes the trajectory
Stopping smoking. It remains the only intervention demonstrated to slow how fast lung function declines. Everything else treats how you feel and how often you get into trouble.
That is not a moral point and it is not meant as a lecture. It is the reason a pulmonary clinic will keep raising it even when you have heard it before, and the reason it is worth asking for real help — medication, counselling, a quit plan — rather than being told to try harder.
Flare-ups are information
An exacerbation is a stretch of days where the breathlessness, cough or sputum gets clearly worse than your normal and needs treatment — usually steroids, antibiotics, or both.
The episode gets treated. What often does not happen is the second step: asking why it happened and whether the maintenance plan is right. A patient having two or more flare-ups a year, or one that puts them in hospital, is in a different risk category from someone having none, and current guidance treats them differently.
If you have had a flare-up in the last year and nobody has revisited your inhalers since, that is a reasonable thing to raise.
What to ask at your visit
Have I had spirometry, and what was my FEV1/FVC ratio? Which of my inhalers is the rescue one and which are the daily ones? How many flare-ups have I had in the past twelve months, and does that number change what I should be on? Am I on an inhaled steroid, and if so, what is the reason?
These are not adversarial questions. They are the ones that let a fifteen-minute appointment get to the part that matters.