Respiratory distress is a serious breathing problem that occurs when the lungs are unable to provide enough oxygen to the body. This condition can affect anyone—from newborns struggling to take their first breaths to adults suddenly gasping for air in hospital intensive care units. Understanding this life-threatening condition means knowing when to seek help, what causes it, and how medical teams work to save lives when every breath counts.

What Is Respiratory Distress?

Respiratory distress describes a situation where someone has severe difficulty breathing. The body is not getting enough oxygen, and this lack of oxygen can quickly affect the brain, heart, kidneys, and other vital organs. When we talk about respiratory distress, we are often referring to two main groups of people: newborn babies, especially those born too early, and critically ill adults or older children who develop a condition called Acute Respiratory Distress Syndrome, or ARDS for short.^[2]

In newborns, respiratory distress syndrome happens when tiny air sacs in the lungs, called alveoli, do not work properly. These air sacs need a special coating substance called surfactant to stay open and allow oxygen to move into the blood. Without enough surfactant, the air sacs collapse, and the baby cannot breathe well.^[3] This condition is most common in babies born before 28 weeks of pregnancy, though it can sometimes affect babies born closer to their due date.^[3]

In adults and older individuals, ARDS is a lung injury that happens when fluid builds up in the alveoli. This fluid leaks from damaged blood vessels and fills the spaces where oxygen should move freely. The result is dangerously low oxygen levels in the blood, a condition called hypoxia. ARDS usually develops within hours to a few days after a serious illness, injury, or infection.^[5] Many people with ARDS are already in the hospital being treated for another serious condition when respiratory distress begins.^[2]

How Common Is Respiratory Distress?

Respiratory distress syndrome in newborns is fairly common among premature babies. The earlier a baby is born, the more likely they are to develop this breathing problem. Babies born before their lungs have had time to make enough surfactant face the highest risk.^[4] Surfactant production in the lungs begins around 26 weeks of pregnancy and increases as the baby grows.^[4]

In adults, ARDS affects about 200,000 people in the United States each year and around 3 million people worldwide.^[5] The condition accounts for roughly 10% of all admissions to intensive care units and is the reason at least 25% of people need a breathing machine, or ventilator, while hospitalized.^[5] During the COVID-19 pandemic, cases of severe ARDS increased dramatically around the world, as the virus often led to serious lung injury.^[5]

What Causes Respiratory Distress?

The root causes of respiratory distress differ depending on whether we are talking about newborns or adults. In newborns, the problem is almost always a lack of surfactant. Surfactant is a liquid made by the lungs that coats the tiny air sacs and keeps them from collapsing. Without it, breathing becomes extremely difficult because the air sacs cannot stay open to let oxygen in and carbon dioxide out.^[4]

While most cases of newborn respiratory distress occur in premature babies, other factors can increase risk. These include having a sibling who had respiratory distress syndrome, being one of twins or multiples, being delivered by cesarean section, having a mother with diabetes, being sick at birth, or experiencing cold stress where the baby cannot keep warm.^[4]

In adults, ARDS is caused by injury to the lungs. The most common cause is sepsis, a serious infection that spreads through the body and triggers widespread inflammation. Sepsis can begin with an infection in the lungs, like pneumonia, or in other organs.^[5] When sepsis is severe, it damages the delicate protective membrane around the alveoli, and fluid leaks into the lung tissue.^[2]

Other causes of ARDS include aspiration, which happens when stomach contents are inhaled into the lungs and cause severe damage. Major trauma or burns from accidents and falls can directly harm the lungs or trigger inflammation that spreads to the lungs. Breathing in high concentrations of chemical fumes or smoke, called inhalational injury, can also lead to ARDS. Severe inflammation of the pancreas, called pancreatitis, is another trigger. Blood transfusions, especially receiving more than 15 units in a short time, can increase risk. Drug overdoses, particularly from cocaine and opioids, are also linked to ARDS. Finally, COVID-19 infection can develop into severe ARDS in some people.^[5]

Risk Factors for Respiratory Distress

Certain groups of people face higher risk for developing respiratory distress. For newborns, being born prematurely is the single biggest risk factor. Babies born before 28 weeks are at greatest risk, but those born any time before 37 weeks can experience breathing problems.^[7] Pregnant women who are likely to deliver early can receive steroid medicines that help the baby’s lungs mature faster and produce more surfactant before birth, which helps prevent respiratory distress.^[7]

For adults, anyone who is critically ill or has suffered major injuries is at higher risk for ARDS. People already hospitalized for serious infections, particularly pneumonia or sepsis, face elevated risk. Those with existing heart or lung disease may develop more severe symptoms if ARDS occurs.^[5] The condition can affect people of any age, though outcomes vary depending on age and how severe the illness becomes.^[2]

Symptoms of Respiratory Distress

The symptoms of respiratory distress are unmistakable signs that breathing has become a serious struggle. In newborns, symptoms appear very quickly, often within minutes or hours of birth. Parents and medical staff may notice that the baby is breathing very fast and making grunting sounds with each breath. The baby’s nostrils may flare wide open as they try to pull in more air. The skin between the ribs, under the ribcage, and at the neck may pull inward with each breath, a sign called retractions. The baby’s lips, fingernails, and skin may take on a bluish color, called cyanosis, which signals that not enough oxygen is reaching the blood.^[7]

In adults and older individuals, symptoms of ARDS can vary depending on what caused the condition and whether the person has pre-existing heart or lung problems. The main symptom is severe shortness of breath that comes on suddenly. Breathing becomes fast, labored, and feels like hard work. The heart races as it tries to pump more oxygen-depleted blood through the body. People may cough and feel chest discomfort. Confusion and extreme tiredness set in as the brain and other organs are deprived of oxygen. The fingernails and lips may turn bluish from low oxygen levels.^[5]

ARDS can develop and worsen very rapidly. What begins as mild breathing difficulty can escalate within hours to life-threatening oxygen deprivation. This is why anyone showing signs of severe breathing trouble needs immediate medical evaluation and treatment.^[5]

How Respiratory Distress Changes Normal Body Function

To understand respiratory distress, it helps to know what happens inside the lungs during normal breathing. When we breathe in, air travels down through the windpipe and into smaller and smaller tubes in the lungs. At the end of these tubes are millions of tiny air sacs called alveoli. These alveoli are surrounded by even tinier blood vessels called capillaries. Oxygen from the air moves through the thin walls of the alveoli and into the blood in the capillaries. At the same time, carbon dioxide, a waste product from the body, moves from the blood into the alveoli to be breathed out.^[2]

In newborn respiratory distress syndrome, the problem starts because the alveoli lack surfactant. Without this coating substance, the alveoli collapse and stick together, making it nearly impossible for them to open up with each breath. The harder the baby tries to breathe, the more work it takes, because the collapsed air sacs resist opening. Less oxygen gets into the blood, and carbon dioxide cannot escape properly.^[4]

In ARDS, the mechanism is different but equally dangerous. An injury or illness damages the protective membrane that lines the alveoli and capillaries. This damage causes the membrane to become leaky. Fluid that should stay inside the blood vessels seeps out into the spaces around the alveoli and eventually floods into the air sacs themselves. When the alveoli fill with fluid instead of air, oxygen cannot pass through to reach the blood. Pressure builds up, and the alveoli begin to collapse. The result is severely reduced oxygen levels in the blood.^[2]

The body’s immune system responds to the lung injury by releasing inflammatory proteins called cytokines and sending white blood cells called neutrophils to the area. While this response is meant to fight infection or repair damage, some of these proteins and cells leak into nearby blood vessels. They travel through the bloodstream to other parts of the body, causing inflammation in organs far from the lungs. Combined with dangerously low oxygen levels, this widespread inflammation can lead to organ damage and sometimes multiple organ failure.^[13]

Prevention of Respiratory Distress

For newborns at risk of respiratory distress syndrome, prevention efforts focus on the mother during pregnancy. When doctors know that a woman is likely to deliver her baby early—before 37 weeks of pregnancy—they can give her steroid medications. These steroids help speed up the development of the baby’s lungs and increase surfactant production before birth. This intervention has proven very effective at reducing the severity of respiratory distress in premature babies.^[7]

Preventing ARDS in adults means promptly treating the conditions that lead to lung injury. Since sepsis is the most common cause of ARDS, quickly identifying and treating infections with appropriate antibiotics is crucial. People who develop sepsis need close monitoring in the hospital to catch early signs of lung problems.^[15] Careful management of patients who have suffered major trauma, burns, or are undergoing complex medical procedures like blood transfusions can also help reduce the risk of ARDS developing.

There is no vaccine or supplement that prevents respiratory distress directly. Prevention strategies center on managing underlying health conditions, avoiding lung injuries, and seeking prompt medical care for serious infections or injuries before they progress to the point of causing lung damage.^[13]