Direct comparison
Cardiology vs Pulmonology: Key Differences
Cardiology covers the heart and blood vessels; pulmonology covers the lungs and breathing. Compare scope, tests, endpoints, funding, training and overlap.
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How do Cardiology, Pulmonology compare side by side?
The table below compares Cardiology, Pulmonology across 12 procurement-relevant dimensions, from core definition through where they overlap, and when to use which.
Side-by-side comparison
| Dimension | Cardiology | Pulmonology |
|---|---|---|
| Core definition | The branch of medicine and biomedical science that studies the heart and blood vessels: how the circulation delivers blood to the body, how it is regulated, and what happens when it is injured, diseased or malformed. | The branch of medicine and biomedical science concerned with the lungs and the rest of the respiratory tract: how they develop, how they work, and what goes wrong with them. Also called pneumology, respirology or chest medicine in some countries. |
| Organ systems | The heart (chambers, valves, electrical conduction system, coronary arteries) and the wider network of arteries and veins. | The upper airway, trachea and bronchial tree, the alveoli where gas exchange occurs, the pulmonary blood vessels, the pleura, and the muscles and nerves that drive breathing. |
| Central physiological question | How does the circulation work? Pressure, flow, contraction and electrical activity. | How do oxygen and carbon dioxide move between air and blood, and how do airflow, lung mechanics, circulation and the brain's control of breathing stay matched to the body's needs? |
| Conditions covered (in general terms) | Coronary artery disease and heart attack, heart failure and cardiomyopathy, rhythm disorders such as atrial fibrillation, valve disease, congenital heart defects, and diseases of the aorta and peripheral vessels. | Asthma and chronic obstructive pulmonary disease (COPD), interstitial and fibrotic lung disease, pulmonary embolism, pneumonia, sleep-disordered breathing, and acute respiratory failure. |
| Typical diagnostics (in general terms) | Electrocardiography and rhythm monitoring, echocardiography, nuclear imaging, cardiac CT and MRI, and invasive coronary angiography and catheterisation. | Spirometry and fuller pulmonary function testing, arterial blood gas and pulse oximetry, chest radiography and CT, bronchoscopy with sampling, and sleep studies. |
| Typical treatments (in general terms) | Drugs, catheter-based procedures, implanted devices such as pacemakers and defibrillators, and surgery delivered with cardiac surgeons. Many cardiology therapies are devices. | Drugs including inhaled therapies, oxygen and ventilatory support, pulmonary rehabilitation, bronchoscopic procedures, and referral for lung surgery or transplantation. Mechanical ventilation is central in critical care. |
| Subfields | General and preventive, interventional, electrophysiology, heart failure and transplant, cardiac imaging, congenital heart disease, cardio-oncology, and cardiovascular genetics. | Obstructive airway disease, interstitial lung disease, pulmonary vascular disease, sleep-disordered breathing, critical care, pediatric pulmonology, interventional pulmonology, and environmental and occupational lung disease. |
| Common trial endpoints (in general terms) | Mortality, clinical events (heart attack, stroke, heart failure hospitalisation), and composites such as MACE, whose component list is chosen by each trial. Blood pressure, cholesterol and imaging measures serve as surrogates. | Lung function (most often FEV1), exacerbation rates, patient-reported symptom and quality-of-life scores, and in critical care mortality and ventilator-free days. |
| Training path (US, general) | Medical school, an internal medicine residency (or pediatrics for pediatric cardiology), then a cardiovascular disease fellowship, often followed by subspecialty training such as interventional cardiology or electrophysiology. | Medical school, an internal medicine residency, then a pulmonary disease fellowship usually combined with critical care medicine. The American Board of Internal Medicine describes combined training as a minimum of three years. Pediatric pulmonology follows a pediatrics route. |
| Research funders | The National Heart, Lung, and Blood Institute (NHLBI) at the US National Institutes of Health, other NIH institutes whose missions touch cardiovascular health, the American Heart Association, and industry sponsors of drug and device trials. | The same NHLBI, through its lung diseases division (which also covers sleep and circadian biology), plus other NIH institutes, voluntary health organisations and disease foundations, and industry sponsors. Confirm current priorities with each funder. |
| Professional societies and journals | The American College of Cardiology (Journal of the American College of Cardiology and related JACC journals), the American Heart Association, and the European Society of Cardiology. | The American Thoracic Society (American Journal of Respiratory and Critical Care Medicine), the American College of Chest Physicians (CHEST), the European Respiratory Society, and the British Thoracic Society (Thorax). |
| Where they overlap, and when to use which | Overlap: pulmonary hypertension, sleep-disordered breathing, and critical care, where heart and lung failure often coexist. Use the cardiology lens when the question is about pump function, rhythm, coronary or valve disease, or vascular risk. | Overlap is the same list, seen from the lung side. In the US, pulmonary and critical care are commonly trained together. Use the pulmonology lens when the question is about airflow, gas exchange, lung tissue disease, sleep apnea or ventilation. |
Common questions
Common questions about Cardiology vs Pulmonology
What is the difference between a cardiologist and a pulmonologist?
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A cardiologist is a physician specialising in the heart and blood vessels; a pulmonologist is a physician specialising in the lungs and breathing. Cardiologists deal with conditions such as coronary artery disease, heart failure and rhythm disorders. Pulmonologists deal with conditions such as asthma, COPD and interstitial lung disease. This is a description of the disciplines, not medical advice.
Do cardiologists and pulmonologists treat the same conditions?
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Mostly different ones, but some conditions sit between them. Pulmonary hypertension involves the blood vessels of the lungs and the right side of the heart, and sleep-disordered breathing and critical illness can involve both organ systems. In those areas the two specialities commonly work together.
Can shortness of breath be a heart problem or a lung problem?
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Yes. Breathlessness can arise from the heart, the lungs, or both, because they share one circulation. That is one reason the two specialities see overlapping patients. Anyone with new or worsening breathlessness should seek advice from a clinician; this page cannot diagnose or advise.
Which specialist does a person see first?
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Referral usually starts with a primary care or family medicine clinician, who decides which specialist, if any, is appropriate. For urgent symptoms, emergency care is the route rather than a specialist appointment. This page does not give individual medical advice.
How does training differ for the two specialties?
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In the United States both begin with medical school and an internal medicine residency. Cardiology then continues into a cardiovascular disease fellowship, with optional further subspecialty training. Pulmonology continues into a pulmonary disease fellowship that is usually combined with critical care medicine, a minimum of three years of combined training according to the American Board of Internal Medicine. Training length and titles differ outside the United States.
How do the two fields differ as research areas?
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Cardiology trials often use composite event endpoints such as MACE and frequently test devices as well as drugs. Respiratory trials often use spirometry measures such as FEV1, exacerbation counts, patient-reported outcomes and, in critical care, ventilator-free days. Both rely on cohort studies, randomized trials, imaging and genetics, and both can be led by non-clinical scientists such as physiologists and epidemiologists.
Who funds cardiology and pulmonology research?
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In the United States the National Heart, Lung, and Blood Institute at NIH is the lead public funder for both heart and lung research. Other NIH institutes, the American Heart Association, other voluntary health organisations and industry sponsors also fund work in each field. Priorities change, so confirm current details with the funder.
