A lung transplant is a life-changing surgical procedure that involves removing one or both diseased lungs and replacing them with healthy lungs from a donor, offering hope to people with severe lung conditions that no longer respond to other treatments.

Understanding Lung Transplantation

A lung transplant is a complex surgical operation designed to replace a diseased or failing lung with a healthy lung from a donor. When lungs become so damaged that they can no longer provide the body with the oxygen it needs to survive, and when medications or breathing devices no longer help, this procedure may become necessary. The replacement lung typically comes from a deceased donor, though in rare cases, a portion of a lung may come from a living donor.^[1]

There are different types of lung transplant procedures, each suited to specific medical situations. A single lung transplant involves removing one diseased lung and replacing it with a donor lung. A double lung transplant replaces both lungs with donated lungs. In some situations, particularly when both heart and lung disease are present, a heart-lung transplant may be necessary, where surgeons replace both the heart and lungs from the same donor.^[2]

While lung transplantation is a major operation that can involve many complications, it has the potential to greatly improve a patient’s health and quality of life. The procedure is reserved for people who have tried other treatments without sufficient improvement, and for whom the lung condition has become life-threatening. Most patients who receive lung transplants come from the pool of approximately 2,500 such procedures performed annually in the United States, though many more people need transplants than there are available donor lungs.^[2]

Epidemiology and Statistics

Lung transplantation has become an increasingly common procedure as the field has evolved and techniques have improved. According to data from 2019, healthcare providers performed approximately 2,500 lung transplants in the United States alone. However, the need far exceeds the supply—more people require lung transplants than there are transplantable lungs available. This shortage has serious consequences, as several hundred people die each year while waiting for a lung transplant.^[2]

The international perspective shows even greater numbers. By June 30, 2018, a total of 69,200 adult lung transplants had been performed worldwide and recorded in the International Thoracic Organ Transplant Registry. This represents decades of work in developing and refining transplant techniques, donor selection, and post-operative care.^[4]

Survival rates after lung transplantation have steadily improved over time. According to the United States Organ Procurement and Transplantation Network and the Scientific Registry of Transplant Recipients, the survival rates for lung transplant recipients are encouraging: 85% survive to one year after the operation, 68% reach the three-year mark, and 55% survive to five years. More than 30% of lung transplant recipients have survived for 10 years or more after their surgery, allowing them to live healthier and longer lives as a result of the procedure.^[4][20]

Regarding age demographics, lung transplantation can be performed on anyone from newborns to adults. Some guidelines suggest that lung transplant patients should ideally be younger than 65 years of age, though many patients over 65 do receive lung transplants. Typically, patients over 75 do not qualify for transplantation, but transplant centers make the final decisions based on individual circumstances and overall health.^[5]

Causes and Conditions Leading to Lung Transplant

A lung transplant becomes necessary when the lungs are so unhealthy or damaged that the body cannot get the oxygen it needs to survive. Many different diseases and conditions can damage the lungs to this extent, preventing them from functioning effectively. Understanding these underlying conditions helps explain why someone might need this life-saving procedure.^[1]

Chronic obstructive pulmonary disease (COPD), which includes conditions like emphysema and chronic bronchitis, is one of the most common reasons for lung transplantation. COPD interferes with normal breathing and progressively worsens over time, eventually reaching a stage where the lungs can no longer support life without replacement.^[1]

Pulmonary fibrosis, or scarring of the lungs, represents another major indication for transplantation. This condition causes the lung tissue to become thick and stiff, making it increasingly difficult for oxygen to pass into the bloodstream. Pulmonary fibrosis is one of the diseases for which lung transplant serves as a treatment option when other therapies have been exhausted.^[1][10]

Cystic fibrosis is a genetic disease that causes problems in the glands that make sweat and mucus. In the lungs, this leads to thick, sticky mucus that clogs the airways and makes breathing progressively more difficult. When cystic fibrosis reaches its severe stages and lung function becomes critically compromised, transplantation may be the only option.^[1]

Pulmonary hypertension, which is high blood pressure in the arteries that bring blood to the lungs, can severely damage lung tissue over time. This condition can lead to heart complications as well, sometimes necessitating a combined heart-lung transplant.^[1]

Other conditions that may lead to lung transplantation include bronchiectasis, COVID-19 complications, various forms of interstitial lung disease, lung injuries, and inherited conditions such as alpha-1 antitrypsin deficiency. Each of these conditions shares a common endpoint: they damage the lungs to such an extent that medications and breathing devices can no longer maintain adequate oxygen levels in the body.^[2]

Risk Factors for Needing Lung Transplantation

While the underlying diseases themselves determine who might need a lung transplant, certain behaviors and conditions can increase the risk of developing severe lung disease in the first place. Understanding these risk factors is important for prevention and early intervention, though once someone has reached the stage of needing a transplant, the focus shifts to managing the transplant process itself.

Tobacco use represents one of the most significant risk factors for developing lung diseases like COPD and emphysema. Smoking damages the delicate tissues of the lungs over time, leading to progressive loss of function. Importantly, anyone being considered for a lung transplant must completely stop using all tobacco products, including cigarettes, cigars, vapes, e-cigarettes, hookahs, and cannabis in smoked form. Even exposure to secondhand smoke can disqualify a patient from the transplant waiting list, as drug tests can detect nicotine and tobacco in the system.^[16]

Genetic factors play a role in conditions like cystic fibrosis and alpha-1 antitrypsin deficiency. People born with these inherited conditions face a higher likelihood of eventually needing lung transplantation if their disease progresses despite medical management. These conditions are present from birth and represent risk factors that cannot be prevented, only managed.^[2]

Environmental and occupational exposures to harmful substances can damage the lungs over time, potentially leading to conditions like pulmonary fibrosis or other interstitial lung diseases. Prolonged exposure to dust, chemicals, or other airborne pollutants in certain work environments can contribute to lung damage that eventually becomes severe enough to require transplantation.

Age can be considered a risk factor in that lung diseases tend to progress over time, and older patients may have accumulated more lung damage. However, age alone does not determine who needs a transplant—it’s the severity of the lung disease and overall health status that matter most. Patients must be healthy enough in other respects to withstand the surgery and post-operative recovery period.

Symptoms Indicating Need for Transplant

The symptoms that indicate someone might need a lung transplant are actually the symptoms of severe, end-stage lung disease that no longer responds to other treatments. These symptoms reflect the body’s struggle to get enough oxygen and can significantly impact every aspect of daily life.

Severe shortness of breath is the hallmark symptom of advanced lung disease. Patients may find themselves unable to perform even simple activities like walking across a room, getting dressed, or having a conversation without becoming breathless. This breathlessness occurs because the damaged lungs cannot efficiently transfer oxygen from the air into the bloodstream, leaving the body starved for oxygen despite breathing efforts.

Many patients with severe lung disease require supplemental oxygen through nasal tubes or masks. As lung disease progresses, oxygen requirements typically increase. Some patients eventually need continuous oxygen support, and in the most severe cases, may require extracorporeal membrane oxygenation (ECMO)—a system that uses catheters inserted into the neck, groin, or chest to pump oxygen directly into the blood. Patients on ECMO must remain hospitalized and often stay sedated on a ventilator during the initial setup, though sedation may be stopped once the system is functioning to allow for physical therapy.^[16]

Extreme fatigue and weakness accompany severe lung disease because the body’s tissues and organs are not receiving adequate oxygen to function properly. This chronic oxygen deprivation affects energy levels, cognitive function, and the ability to maintain muscle mass and strength. Patients may find themselves unable to work, care for themselves, or participate in activities they once enjoyed.

Additional symptoms can include persistent coughing, frequent lung infections, chest pain, and in cases of pulmonary hypertension, swelling in the legs and feet. These symptoms worsen progressively, and when they reach a point where quality of life is severely diminished and survival is threatened despite maximum medical treatment, lung transplantation becomes the remaining option for extending and improving life.

Prevention and Preparation

While preventing the underlying diseases that lead to lung transplant involves avoiding risk factors like smoking and environmental exposures, once someone is on the path toward transplantation, “prevention” takes on a different meaning. It becomes about preventing complications before and after surgery, and preparing the body to be in the best possible condition for the procedure.

Before surgery, patients must undergo an extensive evaluation process. This comprehensive assessment involves meeting with a large transplant team that can include lung doctors (pulmonologists), transplant surgeons, nurse coordinators, social workers, psychologists or psychiatrists, pharmacists, dieticians, and financial coordinators. The evaluation includes numerous appointments and tests to assess both lung function and overall health status.^[16]

Physical preparation is crucial. Despite having severe lung disease, patients are encouraged to maintain as much physical activity as possible before transplant. Physical and occupational therapists, along with pulmonary rehabilitation experts, work with patients to develop realistic and safe exercise plans. Being as strong as possible and in as good physical condition as feasible before surgery actually makes post-operative recovery easier and more successful. Even simple activities like short daily walks, when tolerated, can help maintain strength and conditioning.^[14][16]

Nutritional preparation is equally important. Patients work with dietitians to develop meal plans that support optimal health while waiting for transplant. After transplant, many people experience weight gain due to the medications they must take and because they are no longer working as hard to breathe. Having a solid nutritional foundation before surgery helps patients better manage these post-transplant changes.^[14]

Patients and their caregivers must make practical preparations as well. Because donor lungs can become available at any time, patients on the waiting list must stay within close proximity to their transplant center—often within one to two hours’ travel time. This may mean temporarily relocating, so patients and families need to make arrangements for housing, transportation, and financial support during this waiting period.^[16]

Mental and emotional preparation cannot be overlooked. The transplant process is overwhelming for both patients and their families. Support systems are essential—patients need caregivers who can help them navigate appointments, manage medications, and provide physical and emotional support throughout the process. Many transplant centers connect patients with support groups where they can meet others going through similar experiences.^[16]

The Transplant Waiting List and Allocation System

Once a patient completes their evaluation and is deemed eligible for transplant, they are placed on the transplant waiting list. The waiting list is managed by the United Network for Organ Sharing (UNOS), a non-profit organization that oversees transplant programs in the United States and ensures that organs are distributed fairly and ethically. This system ensures that factors like income or celebrity status do not affect how organs are distributed.^[19]

Patients receive a Lung Allocation Score (LAS), which predicts both how long the patient can survive without a lung transplant and how long they might live after receiving one. A higher LAS score indicates greater medical urgency, meaning the patient will be higher on the waiting list and likely receive a transplant sooner. This scoring system helps ensure that the sickest patients who can benefit most from transplantation receive priority for available organs.^[5]

The allocation system underwent significant changes in 2023, moving to a continuous distribution model. In this system, all factors used in organ matching—including donor compatibility, candidate urgency, and distance from the donor hospital to the transplant hospital—are included in a single, weighted score calculated for each lung transplant candidate and each donor lung. This replaced the previous system where different match factors were determined individually and applied sequentially. The new policy was designed to increase transplant access for more candidates, including those who are the most medically urgent, younger than 18, prior living organ donors, more likely to face immune system rejection, short in stature, or expected to live longer after transplant.^[13]

The waiting time for a lung transplant varies considerably depending on multiple factors, including the patient’s blood type, body size, LAS score, and geographic location. Because transplant surgeons only have four to six hours to complete the transplantation after receiving donor lungs, geography plays a role in determining which patients can receive which organs. This time constraint means patients must remain available and close to their transplant center at all times while on the waiting list.^[19]

Donor lung availability has been enhanced through the use of ex vivo lung perfusion (EVLP), a technology that circulates a solution containing nutrients, proteins, and oxygen through donor lungs. This technique allows transplant teams to evaluate the health of donor lungs, improve their condition, and even reverse some lung damage. EVLP has expanded the pool of usable donor lungs, giving more patients the chance to receive transplants.^[5]

Some patients may be offered lungs from what are called “increased-risk donors.” These are deceased donors who have a higher risk of having an undiagnosed disease such as HIV, hepatitis B, or hepatitis C that could potentially be transmitted to the transplant recipient. However, organs from increased-risk donors are not lower quality—they function just as well as other donor organs. Patients who accept organs from increased-risk donors typically experience shorter wait times. The transplant team discusses these options thoroughly with patients to help them make informed decisions.^[5]

Pathophysiology: How Lung Disease Affects the Body

Understanding what happens in the body when lung disease reaches the stage requiring transplantation helps explain why this surgery is necessary. The lungs serve a fundamental purpose: transferring oxygen from the air we breathe into the bloodstream while removing carbon dioxide, a waste product of metabolism. When this basic function becomes severely impaired, every system in the body suffers.

In normal, healthy lungs, air travels through the airways into millions of tiny air sacs called alveoli. These alveoli are surrounded by tiny blood vessels called capillaries. Oxygen passes through the thin walls of the alveoli into the blood in the capillaries, while carbon dioxide moves from the blood into the alveoli to be exhaled. This gas exchange is efficient and happens with every breath.

In diseases like pulmonary fibrosis, the lung tissue becomes thick, stiff, and scarred. This scarring, called fibrosis, makes the alveoli walls thicker and less elastic. As a result, oxygen cannot easily pass through into the bloodstream, and the lungs cannot expand and contract effectively. Over time, the amount of functional lung tissue decreases, and the patient requires increasingly higher levels of supplemental oxygen just to maintain minimally adequate blood oxygen levels.

With COPD and emphysema, the problem is different but equally devastating. The walls between the alveoli become damaged and destroyed, creating larger air spaces instead of many small ones. This reduces the surface area available for gas exchange. Additionally, the airways become inflamed and narrowed, and may produce excess mucus, making it difficult to move air in and out of the lungs. Patients experience progressive shortness of breath as their lungs lose the ability to efficiently exchange gases.

In cystic fibrosis, thick, sticky mucus clogs the airways. This mucus traps bacteria, leading to repeated lung infections that cause inflammation and progressive damage to the airways and lung tissue. Over time, the accumulated damage leaves less and less healthy lung tissue capable of performing gas exchange.

Pulmonary hypertension causes high pressure in the blood vessels that carry blood to the lungs. This increased pressure damages the blood vessels and makes it harder for the heart to pump blood through the lungs. The right side of the heart must work harder and harder, eventually leading to heart failure (cor pulmonale). The combination of lung and heart dysfunction severely limits the body’s ability to oxygenate blood.

As lung disease progresses to end stage, the body cannot maintain adequate oxygen levels even with maximum supplemental oxygen and medication. This oxygen deprivation affects every organ system. The brain may not function properly, leading to confusion or altered mental status. Muscles become weak and waste away. The heart struggles to pump blood through damaged lungs and may fail. Other organs begin to malfunction. At this critical point, only replacing the diseased lungs with healthy donor lungs can restore adequate oxygen delivery and save the patient’s life.

The Surgery and Immediate Recovery

When donor lungs become available that match a patient’s size, blood type, and other factors, the transplant center contacts the patient. This call can come at any time, and patients must be able to reach the transplant center quickly—within a few hours. The unpredictability of this timing is why patients must stay close to the transplant center while on the waiting list.

During the surgery, surgeons remove the diseased lung or lungs and attach the donor lung to the patient’s airway and to the blood vessels that connect to the heart. The specific surgical technique varies depending on whether one or both lungs are being replaced and the patient’s underlying condition. The operation is complex and typically takes several hours to complete.^[1]

Immediately after surgery, patients are moved to the intensive care unit (ICU). They are placed on a ventilator, which is a machine that breathes for them until they are strong enough to breathe on their own. This period on the ventilator allows the new lungs to begin functioning while the patient recovers from the anesthesia and the trauma of surgery.^[20]

During the ICU stay, the medical team monitors the patient closely for any signs of complications. They check to ensure the new lungs are functioning properly, that the surgical connections are healing well, and that the patient is not developing infections or experiencing rejection of the new organ. Blood tests, chest X-rays, and other monitoring help the team assess how well the patient is recovering.^[20]

Patients begin taking immunosuppressant drugs immediately after surgery. These medications prevent the body’s immune system from attacking and rejecting the new lungs, which the immune system recognizes as foreign tissue. Taking immunosuppressant medications correctly is absolutely critical for the survival of the transplanted lungs. Patients must continue these medications for the rest of their lives.^[9]

Once patients have gained enough strength and stability, they are moved from the ICU to a regular patient room. The typical hospital stay after lung transplant is about three weeks. During this time, patients continue healing and begin important therapies to help them recover. Physical therapy helps rebuild strength and endurance. Breathing therapy, also called pulmonary rehabilitation, teaches techniques to help the new lungs work effectively and prevent complications. If patients experience trouble speaking or swallowing after surgery, speech therapists work with them to regain these functions.^[20]

Movement and activity are important parts of recovery even while still in the hospital. Getting out of bed, sitting in a chair, and walking short distances help encourage air to flow properly in the lungs and prevent complications like blood clots and pneumonia. The medical team encourages patients to gradually increase their activity level as they grow stronger.

Life After Lung Transplant

After leaving the hospital, patients enter a critical phase of recovery that requires dedication, discipline, and ongoing medical care. For the first two to three months after surgery, patients should plan to stay within one to two hours of the transplant center. The medical team needs to see them frequently during this period to monitor how the new lungs are functioning, adjust medications, and watch for any signs of complications or rejection.^[19][20]

Having a caregiver is not just helpful—it’s essential. For at least the first few months, patients should always have someone with them. This caregiver helps with daily tasks, transportation to appointments, medication management, and monitoring for warning signs that require medical attention. The recovery process is not something anyone can manage alone.^[20]

Taking medications exactly as prescribed is absolutely critical. Immunosuppressant drugs must be taken on schedule every day to prevent rejection of the transplanted lungs. Missing doses or taking medications incorrectly can lead to rejection, which can damage or destroy the new lungs. Patients typically take multiple medications including immunosuppressants, antibiotics to prevent infections, and drugs to manage side effects of the immunosuppressants. The medication regimen is complex and requires careful attention.^[9]

Physical recovery continues at home. Initially, patients have less energy than before surgery because the body needs time to heal and adjust to new medications. Short daily walks, when tolerated, help rebuild strength and endurance. Patients should gradually increase their activity level as recommended by their transplant team, but must also listen to their bodies and rest when needed. Most people can return to normal activities, including work or school, within three to six months after transplant, though this timeline varies for each individual.^[14][18]

Patients cannot drive for about four weeks after transplant. The medications can cause tremors, weakness, and blurred vision, making it unsafe to operate a vehicle. The transplant team will advise when it is safe to resume driving.^[18]

Nutrition plays an important role in recovery and long-term health. Many people gain weight after transplant due to improved appetite, medications (particularly prednisone), and reduced energy expenditure from breathing. Working with a dietitian helps patients maintain a healthy weight and optimal nutrition to support the new lungs and overall health.^[14]

Preventing infections is crucial because immunosuppressant medications make patients more vulnerable to illness. Patients should avoid crowds and people who are sick, especially during the first few months after transplant. Hand washing becomes a critical daily habit. Some precautions regarding pets are necessary—birds should not be kept in the home as their droppings can cause lung infections, cats should be declawed, and patients should not change cat litter. Questions about other pets should be discussed with the transplant team.^[18]

Regular monitoring and follow-up care continue for life. Patients have frequent appointments initially, which gradually space out as they recover. These appointments include lung function tests to monitor how well the lungs are working, blood tests to check medication levels and organ function, and screening for complications. Patients must also maintain regular check-ups with their primary care physician for general health maintenance, including cancer screenings, since immunosuppressant medications increase the risk of certain cancers.^[18]

Many lung transplant recipients return to a good quality of life within three to six months after surgery. They can resume hobbies, social activities, travel, and work. While life requires adjustments and ongoing medical management, the improvement in breathing and overall health allows many people to enjoy activities that were impossible before transplant. The key is approaching recovery with patience, following medical advice carefully, and maintaining open communication with the transplant team about any concerns or changes in health status.