Chronic Obstructive Pulmonary Disease (COPD)

What is COPD?

COPD is not just one disease, itโ€™s a group of conditions, mainly chronic bronchitis and emphysema that cause airflow blockage and breathing problems.

Definition: โ€œChronic Obstructive Pulmonary Disease (COPD) is a heterogeneous lung condition characterized by chronic respiratory symptoms (dyspnea, cough, sputum production and/or exacerbation) due to abnormalities of the airways (bronchitis, bronchiolitis) and/or alveoli (emphysema) that cause persistent, often progressive, airflow obstructionโ€(GOLD 2026).

World COPD Day (19 November 2025) is a global healthcare event to raise awareness of COPD, amongst the general public around the world. It had been observed every year on the 3rd Wednesday of November for the past 23 years.

Theme of World COPD day, 2025: โ€œShort of Breath, Think COPDโ€ Emphasize the importance of early diagnosis COPD, which is common, preventable and treatable condition but often under diagnosed.

Epidemiology

COPD affects more than 300 million people globally and is the third leading cause of death worldwide. It is more prevalent in individuals over 40 years of age and in populations with high tobacco use or exposure to biomass fuels.

Projections indicate that the absolute number of cases will continue to rise, approaching 600 million by 2050, driven by an aging global population.

Risk factor/Causes:

  • Tobacco smoking:
  • It is the most common and primary risk factor/cause of COPD
  • Cigarette smoking is the number one cause Out of all smoking forms
  • Air pollution and biomass fuel (such as wood or charcoal smoke)
  • Occupational Exposure: Exposure to dust, fumes and chemicals in the workplace.
  • Genetics: Alpha-1 Antitrypsin Deficiency (AATD)
  • Other factors: A history of childhood infections, repeated respiratory infections, crowded or polluted living conditions and asthma.

Cigarette smoke is composed of thousands of chemicals, including:

  • Free radicals (such as superoxide anion and hydroxyl radicals)
  • Reactive oxygen species (ROS) (such as hydrogen peroxide)
  • Other toxic compounds (like tar, nicotine, carbon monoxide, formaldehyde, acrolein, etc.)

Note: Per puff of cigarette contains roughly 10ยนโดโ€“10ยนโต oxidant molecules (free radicals). No amount of smoking is safe, even a few cigarettes in a day or months.

How does smoking damage the lungs?

  • Destroys air sacs (results-Emphysema)
  • Narrows and Inflames the airways (Chronic Bronchitis)
  • Weakens the lungs defense system
  • Causes lung cancer
  • Triggers asthma attacks
  • Antioxidant depletion

Pathophysiology

Chronic inflammation in the airways leads to structural changes, mucus hypersecretion, and destruction of alveolar walls. This results in airflow limitation, gas trapping, and impaired gas exchange. Oxidative stress and protease-antiprotease imbalance play key roles in tissue damage.

Clinical Features:

  • Chronic cough
  • Sputum production
  • Dyspnea (shortness of breath), especially during activity
  • chest tightness
  • Wheezing

Exacerbations: Episodes of worsening symptoms that leads to change in course of treatment are common and contribute to morbidity and mortality.

โ€œAn exacerbation of COPD defined as an event characterized by dyspnea and/or cough and sputum that worsen over <14 daysโ€. Exacerbations of COPD are often associated with increased local and systemic inflammation caused by airway infection, pollution, or other insults to the lung.

Diagnosis: Diagnosis is confirmed with spirometry, showing a post-bronchodilator FEVโ‚/FVC ratio < 0.70. Additional tests (chest X-ray, CT scan, blood gases) assess severity and complications.

Management:

  • Smoking cessation is the most effective intervention.
  • Pharmacologic therapy:
  • Bronchodilators (ฮฒโ‚‚-agonists, antimuscarinics)
  • Inhaled corticosteroids (in selected cases)
  • Phosphodiesterase-4 inhibitors (for severe cases)
  • Non-pharmacologic therapy:
  • Smoking cessation
  • Pulmonary rehabilitation
  • Healthy Nutrition
  • Long term Oxygen therapy for chronic hypoxemia
  • Noninvasive Positive Pressure Ventilation(NIPPV)
  • Surgical options: Lung volume reduction surgery (LVRS) or transplantation in advanced disease.

Prevention: Protect Your Lungs

COPD is largely preventable. The best ways to protect your lungs include:

  • Quit smoking: Your Lungs Will Thank You
  • Avoid air pollutants
  • Wear masks or protective equipment if you work in dusty or chemical-filled environments.
  • Keep your vaccinations up to date, especially against flu and pneumonia.
  • Exercise regularly
  • Maintain a healthy diet
  • Regular check-ups with healthcare providers

Health Tips for Preventing and Managing COPD:

โ€œCOPD canโ€™t be cured, but it can be controlled with healthy habits and medicationโ€

  • Quit Smoking: Your Lungs Will Thank You
  • Keep Your Air Clean
  • Get Regular Health Check-Ups
  • Take Medications as Prescribed
  • Stay Active
  • Eat Healthy for Lung Strength
  • Stay hydrated
  • Protect Yourself from Infections: Get your flu and pneumonia vaccines
  • Manage Stress and Mental Health
  • Know and Manage Exacerbations
  • Celebrate Small Wins: Every smoke-free day, every walk, and every check-up helps your lungs. Stay positive, follow your care plan, and keep learning about COPD.