COPD
Symptoms, Causes & Treatment
Chronic Obstructive Pulmonary Disease (COPD) is a progressive, largely irreversible lung condition caused primarily by smoking. It affects around 1.2 million diagnosed people in the UK — with an estimated equal number undiagnosed. COPD is highly manageable with the right treatment.
What is COPD?
COPD is a chronic inflammatory lung disease characterised by persistent airflow limitation and progressive breathlessness, caused primarily by tobacco smoke. It encompasses emphysema (destruction of alveoli) and chronic bronchitis (mucus hypersecretion and chronic cough). COPD is the third leading cause of death worldwide and the most common preventable cause of respiratory disability in the UK. With early diagnosis and optimal management, disease progression can be substantially slowed.
Symptoms of COPD
COPD symptoms develop insidiously over years. Many people attribute early breathlessness to ageing or deconditioning and present late. Spirometry is the only way to confirm the diagnosis.
Progressive breathlessness on exertion worsening over months or years · Chronic productive cough with white or grey sputum · Frequent chest infections · Wheeze · Fatigue · Weight loss in advanced disease · Reduced exercise tolerance
Acute severe breathlessness beyond usual COPD baseline · Confusion or reduced consciousness · Cyanosis (blue lips) · Oxygen saturation below 88% · Unable to complete sentences · Chest tightness unresponsive to rescue medication
COPD exacerbation with severe breathlessness at rest, confusion, cyanosis, SpO2 below 88%, or not responding to rescue inhalers — call 999 immediately.
What Causes COPD?
COPD is caused primarily by cigarette smoking and results in progressive, irreversible airflow obstruction. Understanding the mechanisms and complications guides long-term management.
COPD is caused by irreversible progressive airflow obstruction from emphysema (destruction of alveoli) and chronic bronchitis (mucus hypersecretion and chronic cough). Smoking causes 90% of cases. It is staged by FEV1 using the GOLD system.
Smoking is the dominant cause of COPD. Tobacco smoke triggers chronic airway inflammation, protease-antiprotease imbalance, and oxidative stress, destroying alveolar tissue and causing irreversible airflow limitation.
COPD exacerbations — acute worsening of symptoms beyond normal day-to-day variation — accelerate disease progression, cause hospitalisation, and significantly increase mortality. Most are triggered by respiratory infections.
COPD causes systemic effects including muscle wasting, cachexia, depression, osteoporosis, and cardiovascular disease. These extrapulmonary manifestations worsen quality of life and require integrated management beyond inhaler therapy.
Occupational dusts (coal, grain, cotton), fumes, and chemicals cause up to 15% of COPD cases. Alpha-1 antitrypsin deficiency is a rare genetic cause causing early-onset emphysema, particularly in non-smokers.
Pulmonary hypertension and cor pulmonale (right heart failure) are serious complications of severe COPD, causing leg oedema, worsening breathlessness, and significantly worse prognosis.
Key Risk Factors
Diagnosing COPD
COPD is confirmed by spirometry showing an FEV1/FVC ratio below 0.7 after a bronchodilator. Spirometry is essential — clinical assessment alone cannot reliably distinguish COPD from asthma or heart failure.
Treatment for COPD
COPD treatment follows a stepwise approach using long-acting bronchodilators as the foundation, with add-on therapies based on exacerbation frequency and eosinophil count.
Supportive Measures
Use bronchodilator inhalers as prescribed. Practice pursed-lip breathing to reduce breathlessness. Stay as physically active as possible. Eat little and often if breathlessness impairs eating. Maintain good indoor air quality and avoid pollution. Get emotional support for the psychological burden of chronic disease.
Long-Term COPD Management
COPD management is a long-term commitment. Patients should have annual reviews assessing spirometry, symptom control, exacerbation frequency, inhaler technique, nutritional status, mood, and exercise capacity. Step-up treatment decisions should be guided by symptoms and eosinophil counts.
When to Seek Help
Acute severe exacerbation with confusion, cyanosis, SpO2 below 88%, or breathing rate above 30/min — call 999 immediately. Do not use high-flow oxygen in COPD without medical supervision.
New or worsening breathlessness with a cough or coloured sputum may be a COPD exacerbation. Start rescue medication if available and contact a GP same-day. Go to A&E if symptoms are severe.
Preventing & Slowing COPD Progression
COPD is largely preventable — the primary cause is cigarette smoking, and stopping smoking at any age slows disease progression.
Stopping smoking is the most important step to prevent and slow the progression of COPD. Every year without smoking significantly slows lung function decline. Nicotine replacement therapy, varenicline, and bupropion are all effective aids.
Annual flu vaccine and pneumococcal vaccine reduce exacerbation frequency. COPD exacerbations triggered by infections are the most common cause of hospitalisation and disease progression.
All eligible patients should complete a pulmonary rehabilitation programme. PR improves breathlessness, exercise capacity, and quality of life more than any pharmacological therapy in stable COPD.
Early recognition and prompt treatment of COPD exacerbations prevents hospitalisation. Keep a rescue pack (prednisolone + antibiotic) at home if prescribed. Know your personal early warning signs.
Maintain BMI above 20. Malnutrition accelerates muscle wasting in COPD and worsens prognosis. High-calorie, protein-rich dietary supplements may be needed in advanced disease.
COPD should be reviewed at least annually. Review includes spirometry, inhaler technique check, exacerbation frequency, BMI, MRC dyspnoea score, and mental health assessment.
Getting Treatment for COPD
A GP can diagnose COPD with spirometry, prescribe inhalers, arrange pulmonary rehabilitation, and manage exacerbations. An online GP consultation is an effective first step for new respiratory symptoms or inhaler reviews.
Expert clinical advice, when you need it.
COPD — Frequently Asked Questions
COPD cannot be cured, but its progression can be significantly slowed. Stopping smoking is the single most effective intervention. With optimal inhaler therapy, pulmonary rehabilitation, and vaccinations, most people with COPD maintain a good quality of life for many years.
Spirometry is the gold standard for diagnosing COPD. It measures how much air you can blow out in one second (FEV1) and the total amount expelled. A ratio of FEV1 to FVC below 0.7 after a bronchodilator confirms COPD. A GP can arrange spirometry at the practice.
Stopping smoking is the most important step you can take. It significantly slows lung function decline and reduces exacerbation risk. Completing pulmonary rehabilitation, using inhalers correctly, staying vaccinated, and maintaining a healthy weight all significantly improve long-term outcomes.
A COPD exacerbation is a sudden worsening of breathlessness, cough, or sputum production beyond normal day-to-day variation. If you have a rescue pack (prednisolone + antibiotic), start it promptly. If symptoms are severe or not improving, seek urgent GP or hospital review.
Inhaled steroids are only recommended in COPD for people with frequent exacerbations and elevated blood eosinophils. Unlike in asthma, ICS alone is not sufficient for COPD — long-acting bronchodilators (LAMA and LABA) are the cornerstone of treatment.
Pulmonary rehabilitation is a structured 6–8 week programme of supervised exercise and education. It is the most effective single intervention for improving breathlessness and quality of life in COPD, more effective than any medication. Ask your GP for a referral.
Long-term oxygen therapy (LTOT) is only prescribed for people with severe resting hypoxia confirmed on arterial blood gas testing. It needs to be used for at least 15 hours per day to improve prognosis. It is not a treatment for breathlessness in people with normal oxygen levels.
Yes. Depression affects up to 40% of people with COPD and significantly worsens outcomes. It should be actively screened for and treated. Exercise, pulmonary rehabilitation, and social support all reduce depression rates in COPD alongside medication where needed.