Overview
Chronic obstructive pulmonary disease (COPD) is a common lung disease that restricts airflow and causes breathing problems, including chronic bronchitis and emphysema, most often caused by long-term exposure to tobacco smoke or air pollution.
Disease Summary
- Category
- Non-Communicable Disease
- Cause
- Long-term exposure to lung irritants, most often tobacco smoke or household air pollution, causing airway damage
- Transmission
- Not applicable; COPD is a non-communicable lung disease and cannot be spread between people
- Body System
- Respiratory System
- Preventable
- Yes
- Curable
- No
Symptoms
Common Symptoms
COPD symptoms usually develop gradually and worsen over time.
Chronic Cough
A persistent cough, often producing mucus, is one of the earliest signs of COPD.
Excess Mucus (Phlegm)
Ongoing mucus production that doesn’t go away is common in COPD.
Shortness of Breath
Breathlessness that worsens with physical activity and, over time, even at rest.
Wheezing
A whistling or squeaky sound while breathing, especially during exhalation.
Danger Signs
Seek emergency medical attention immediately if any of the following develop.
Severe Breathlessness
A sudden, severe worsening of breathing difficulty needs emergency medical attention.
Blue Lips or Fingertips
A bluish tinge to the lips or fingertips indicates low oxygen levels and is a medical emergency.
Confusion or Drowsiness
Can indicate dangerously low oxygen or high carbon dioxide levels.
Rapid Heartbeat
A fast or irregular heartbeat during a flare-up should be evaluated promptly.
Diagnosis
Clinical Assessment
Diagnosis begins with reviewing symptoms, smoking history, and exposure to lung irritants.
Spirometry (Lung Function Test)
A breathing test that measures how much and how quickly air can be exhaled, confirming airflow limitation.
Imaging
Chest X-rays or CT scans can help assess lung damage and rule out other conditions.
Laboratory Tests
Spirometry
Measures airflow limitation and lung function, the key test used to diagnose and stage COPD.
Chest X-ray
Helps rule out other conditions and can show signs of lung damage.
Pulse Oximetry
Measures blood oxygen levels, particularly useful during flare-ups.
Arterial Blood Gas Test
Measures oxygen and carbon dioxide levels in the blood in more severe cases.
Treatment
Bronchodilator Medication
Inhaled medications relax the airway muscles and are the mainstay of COPD treatment.
Pulmonary Rehabilitation
A structured programme combining exercise, education, and breathing techniques improves symptoms and quality of life.
Prevention
Avoid tobacco smoke
Not smoking, and avoiding secondhand smoke, is the most effective way to prevent COPD.
Reduce exposure to indoor air pollution
Using cleaner cooking fuels and improving ventilation lowers the risk from household air pollution.
Limit exposure to workplace dust and chemicals
Using protective equipment in jobs with airborne irritants reduces long-term lung damage.
Get recommended vaccinations
Flu and pneumonia vaccines can help prevent respiratory infections that worsen COPD.
Risk Factors
High Risk
These factors substantially increase the likelihood of developing COPD.
- Long-term tobacco smoking
- Prolonged exposure to household air pollution, such as smoke from solid cooking fuels
- Occupational exposure to dust, fumes, or chemicals
Increased Risk
These factors are associated with a moderately higher risk of COPD.
- Older age
- History of childhood respiratory infections
- Family history of COPD
Additional Contributing Factors
Other factors linked with an increased likelihood of COPD.
- Outdoor air pollution
- Genetic conditions affecting the lungs, such as alpha-1 antitrypsin deficiency
- Poorly controlled asthma over many years
Complications
Respiratory Failure
Severe COPD can progress to the point where the lungs can no longer provide enough oxygen or remove enough carbon dioxide.
Heart Problems
COPD increases the risk of heart disease and can strain the right side of the heart over time.
Frequent Respiratory Infections
Damaged airways make people with COPD more prone to lung infections, which can worsen the disease.
When to Seek Medical Care
Sudden Severe Breathlessness
A rapid worsening of breathing difficulty needs urgent medical evaluation.
Blue Lips or Fingertips
Indicates dangerously low oxygen levels and requires emergency care.
Increased Swelling in the Legs
May indicate the heart is being strained by lung disease.
Worsening Cough or Mucus Colour Change
A change in mucus colour or amount, combined with fever, may indicate a respiratory infection.
Prognosis
Manageable with Consistent Treatment
Many people with COPD maintain a good quality of life with appropriate treatment and lifestyle changes.
Progressive Without Intervention
COPD tends to worsen over time, especially if smoking or exposure to irritants continues.
Improved Outcomes with Smoking Cessation
Quitting smoking at any stage slows disease progression and improves long-term outlook.
Differential Diagnosis
Asthma
Also causes wheezing and breathlessness, but symptoms are typically more variable and reversible than in COPD.
Heart Failure
Can cause breathlessness and fluid retention that may resemble advanced COPD.
Bronchiectasis
A different chronic lung condition causing persistent cough and mucus production, distinguished through imaging.
Lung Cancer
Can cause similar respiratory symptoms and should be considered, especially with unexplained weight loss or coughing up blood.
References
World Health Organization (WHO)
WHO fact sheet on the global burden, causes, and management of COPD.
Centers for Disease Control and Prevention (CDC)
CDC guidance on COPD symptoms, risk factors, and available resources.
National Heart, Lung, and Blood Institute (NHLBI)
NIH guidance on COPD causes, diagnosis, and treatment.
Frequently Asked Questions
Can COPD be cured?
No. There is no cure, but treatment can relieve symptoms, slow progression, and help people stay active.
Can non-smokers get COPD?
Yes. While smoking is the leading cause, household air pollution, workplace exposures, and genetic factors can also cause COPD.
Is COPD the same as asthma?
No. Both cause breathing difficulty, but COPD typically causes more persistent, less reversible airflow limitation, though a person can have both conditions.
Does quitting smoking help once COPD has already developed?
Yes. Quitting smoking at any stage slows the progression of COPD and improves long-term outcomes.