COVID Lung Damage: Symptoms, Causes, Treatment and Recovery — What You Need to Know
Updated: 15 minutes ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026
Quick Answer
COVID lung damage happens when severe inflammation from COVID-19 injures the lungs’ tiny air sacs. This can make you very sick during the infection — with pneumonia or respiratory distress — or it can linger after the infection is gone, leaving you short of breath and tired. There are limited treatments once the damage occurs, but oxygen therapy, antivirals and hospital support can help. Scarring can last a long time or be permanent. Getting vaccinated and taking antivirals early lower your risk.
TL;DR
COVID-19 lung damage is caused by an immune system overreaction that produces too much inflammation. Air sacs fill with fluid, oxygen can’t reach the blood, and inflammation can leave behind nodules or permanent scarring. Complications include pneumonia, ARDS, pulmonary fibrosis and long COVID. Once damage happens, treatment focuses on oxygen and fighting the infection — antivirals work best within the first five days of symptoms. Prevention starts with vaccination, quitting smoking and avoiding infection.
Important limitation: the source material does not provide statistics on how many people develop lung damage, hospitalization rates, or the proportion of damage that becomes permanent, so no figures are quoted here. Everything in this article is drawn from a single medically reviewed reference page.
When to get emergency help: go to the emergency room or call 911 if you have COVID-19 and develop severe shortness of breath or difficulty breathing, confusion, inability to stay awake, or bluish skin, lips or nails.
What Is COVID Lung Damage?
COVID-19 lung damage can happen when you are sick with the respiratory illness COVID-19. Severe inflammation can cause lung damage that makes you very sick all at once — with pneumonia or respiratory distress. Or it can linger for a long time after the infection is gone, making you short of breath and tired.
It is not uncommon for severe respiratory illnesses, like the flu, to lead to lung damage. But when COVID-19 first started spreading, healthcare providers became concerned about how quickly it caused severe illness.
Some data suggest that Omicron variants more frequently cause upper respiratory infections than previous versions of COVID. But they are also still capable of causing lung damage and severe complications.
What Are the Symptoms of COVID Lung Damage?
If you are currently sick with COVID, symptoms of conditions caused by lung damage could include:
Symptom | What it looks like |
Difficulty breathing / shortness of breath | Struggling to breathe, especially with effort |
Extreme fatigue / tiredness | Far more tiredness than a typical cold causes |
Fever | Elevated body temperature |
Bluish or grayish skin, lips or nails (cyanosis) | A warning sign of low oxygen |
Fast, labored breathing | Rapid, hard-working breaths |
Chest pain or tightness | Discomfort or pressure in the chest |
Can COVID Lung Damage Cause Symptoms Later?
Lasting lung damage from COVID — once you are past the acute infection — might not cause any symptoms. But it could make you short of breath or tired more easily. It also could potentially cause symptoms that get worse over time.
What Causes COVID Lung Damage?
An immune system overreaction can cause lung damage in COVID. Immune cells come to the site of infection to fight it off, which causes inflammation. But out-of-control inflammation can damage healthy tissues.
Damage and weakness in the walls of the small air sacs in your lungs (alveoli) can cause them to fill with fluid. This means air can’t get in and oxygen can’t get to your bloodstream and out to your tissues.
Inflammation can also leave pulmonary nodules or scarring behind, which can take a long time to resolve or could be permanent.
This kind of damage can happen with many kinds of respiratory infections, not just COVID. But COVID seems more likely to cause severe damage. This could be due to it creating immune system overreactions, like cytokine storms, or because of how it uses your immune cells to invade your lungs.
Who Is at Higher Risk of Lung Damage From COVID?
You are at an increased risk of getting very sick with COVID-19 — which could lead to lung damage — if you:
Are over 65.
Are pregnant.
Smoke or used to smoke.
Are an organ transplant or stem cell transplant recipient.
Aren’t vaccinated.
Have a compromised immune system — this could be due to cancer, medications, HIV or primary immunodeficiency.
You might also be at increased risk if you have certain health conditions, including:
Condition category | Examples |
Cancer | Any type |
Chronic lung disease | Asthma, COPD, cystic fibrosis and others |
Organ conditions | Conditions affecting your heart, kidneys, liver, blood or brain |
Congenital conditions | Present-at-birth conditions like cerebral palsy or Down syndrome |
Metabolic conditions | Diabetes |
Mental health disorders | Any diagnosed mental health disorder |
Obesity | Weight significantly over healthy range |
Substance use disorders | Drug or alcohol use disorders |
For more on chronic lung conditions that raise risk, see our guides to allergic asthma and cystic fibrosis.
What Are the Complications of COVID Lung Damage?
Inflammation caused by COVID and other infections can lead to:
Complication | What it is |
Pneumonia | An infection in your lungs that causes the air sacs to fill with fluid |
Acute respiratory distress syndrome (ARDS) | A serious condition where much of your alveoli are filled with fluid and oxygen can’t get to your bloodstream |
Lung nodules | Damage from inflammation can leave behind lung nodules |
Pulmonary fibrosis (scarring) | Areas of lung damage can turn into scarring. Sometimes scarring can continue to progress, even after you have fought off the infection |
Long COVID | Some people continue to experience symptoms for months or years after having COVID |
To learn more about lung scarring, see our guide to pulmonary fibrosis.
How Is COVID Lung Damage Diagnosed?
A healthcare provider looks for lung damage using imaging or a bronchoscopy — a lighted tube a provider uses to look inside your airways. They may also use other tests to diagnose infections, like pneumonia.
What Tests Will Be Done?
Providers might perform these tests to look for lung conditions and diagnose infections:
Test | How it works |
Nasal swab | A thin stick with a soft tip swabs inside your nose or throat; a lab tests the sample for COVID-19 and other viruses |
Pulse oximetry | A sensor slips over your finger and measures the amount of oxygen in your blood, showing how well your lungs are working |
Imaging | A chest X-ray or CT scan takes pictures of your lungs to look for damage |
Blood tests | Help look for infections and check your overall health |
Sputum test | You cough and spit into a container; the sample is tested for infections |
Pleural fluid culture | A thin needle takes a small amount of fluid from around your lungs to test for infections |
Arterial blood gas test | Helps providers determine how well your lungs are working |
Bronchoscopy | A bronchoscope looks at your lungs or takes tissue or fluid samples for lab testing |
How Is COVID Lung Damage Treated?
There aren’t many ways to treat lung damage after it has happened. But providers can help you get the oxygen you need. If you have a condition like pneumonia or ARDS due to a COVID infection, your provider might treat you with:
Supportive treatment | What it does |
Supplemental oxygen | Extra oxygen through a tube in your nose or a mask on your face if your lungs are working but not getting quite enough oxygen |
IV fluids | Extra fluid through an IV keeps you from getting dehydrated |
Mechanical ventilation | A ventilator if you are unable to breathe on your own |
Proning | Being placed on your belly for several hours a day to help your lungs work more efficiently |
ECMO (extracorporeal membrane oxygenation) | Life support that takes over the work of your heart and lungs if your organs aren’t working properly |
Fluid draining | A catheter or surgery drains fluid in your lungs |
Medications That Fight the Infection
Medication type | Examples and purpose |
Antiviral medications | Remdesivir or Paxlovid can help you fight off a COVID infection |
Corticosteroids | Steroids or other anti-inflammatory medications to reduce swelling |
Monoclonal antibodies | Treatments such as tocilizumab can help reduce or prevent inflammation |
Antibiotics | Prescribed if you also have a bacterial infection in addition to COVID |
Rarely, people with lasting, severe lung damage from COVID have received a lung transplant. There are also some medications that might slow down pulmonary fibrosis if it continues to get worse.
What Can I Expect if I Have COVID Lung Damage?
If you have pneumonia or ARDS from COVID, you will need to stay in the hospital so providers can help you breathe while your body recovers from the virus.
Lung scarring may last a long time or be permanent. In some cases, fibrosis from infections can continue to get worse over time, even after your other symptoms have gone away.
And there is no way to predict who will get severe or long-lasting illness and who will not.
When Should You See Your Healthcare Provider?
If you test positive for COVID-19, ask your provider as soon as possible if you should take an antiviral medication. It is most effective when taken in the first five days of symptoms.
If you still have shortness of breath, tiredness or other symptoms, talk to your provider. There are designated long COVID clinics that might be able to help you feel better.
Questions to Ask Your Doctor
Your question | What the answer helps you understand |
Are any treatment options available? | What can actually be done for the damage |
Can this go away on its own? | Whether the damage is temporary or lasting |
How do I take care of myself? | Daily self-care while you recover |
Can COVID Lung Damage Be Prevented?
The best way to prevent lung damage is to avoid getting an infection. You can help reduce your risk of getting severe COVID-19 by:
Getting vaccinated — vaccination for COVID and other illnesses, like the flu, might reduce your risk of getting sick or getting severely sick.
Quitting smoking and avoiding secondhand smoke — smoking damages your lungs, which means you may be more likely to get an infection that leads to pneumonia.
Washing your hands with soap and water before eating, before handling food and after going to the bathroom (if you don’t have access to soap, use an alcohol-based hand sanitizer).
Avoiding close contact and sharing items with other people.
Managing other health conditions you have, as they can put you at a higher risk for severe COVID-19.
If you do get sick, antiviral medications can help keep you from getting severely ill if you take them within the first five days of your illness.
Conclusion
COVID-19 lung damage results from an immune system overreaction that floods the lungs’ air sacs with fluid and leaves behind inflammation, nodules or permanent scarring. It can strike suddenly during the illness as pneumonia or ARDS — or linger quietly afterward as breathlessness, fatigue and progressive fibrosis.
There is no cure for the damage itself, but oxygen therapy, antivirals, anti-inflammatory medications and hospital support give the body the best chance to recover. And because no one can predict who will develop severe or long-lasting illness, prevention matters most: vaccination, quitting smoking, hand hygiene and early antivirals within the first five days of symptoms.
Next step: if you have tested positive for COVID-19, contact your provider immediately about antiviral treatment. If lingering shortness of breath or fatigue persists after your infection, ask about a long COVID clinic. Know the emergency signs — severe breathing trouble, confusion, inability to stay awake and bluish lips — and act without delay.
Frequently Asked Questions
What is COVID lung damage?
COVID-19 lung damage happens when severe inflammation from the illness injures your lungs. It can make you very sick all at once with pneumonia or respiratory distress, or linger long after the infection is gone, leaving you short of breath and tired.
What causes COVID lung damage?
An immune system overreaction. Immune cells rush to fight the infection and cause inflammation — but out-of-control inflammation damages healthy lung tissue, including the walls of the air sacs (alveoli).
Why do the air sacs fill with fluid?
Damage and weakness in the walls of the alveoli cause them to fill with fluid. Air can’t get in, and oxygen can’t reach your bloodstream and tissues.
Can COVID cause permanent lung damage?
Inflammation can leave pulmonary nodules or scarring that takes a long time to resolve or could be permanent. Lung scarring may last a long time or be permanent, and fibrosis can continue to worsen over time even after other symptoms are gone.
Can lung damage from COVID get worse over time?
Yes. Scarring from inflammation can continue to progress even after you’ve fought off the infection, and lasting damage could potentially cause symptoms that worsen over time.
What are the symptoms of COVID lung damage?
During the illness: shortness of breath, extreme fatigue, fever, bluish or grayish skin/lips/nails (cyanosis), fast labored breathing, and chest pain or tightness. After the illness: it may cause no symptoms, or make you short of breath or tired more easily.
What does bluish or grayish skin mean?
Cyanosis — a sign of low oxygen. Go to the ER immediately if you notice bluish skin, lips or nails.
What are the complications of COVID lung damage?
Pneumonia, acute respiratory distress syndrome (ARDS), lung nodules, pulmonary fibrosis (scarring), and long COVID (symptoms lasting months or years).
What is ARDS from COVID?
Acute respiratory distress syndrome is a serious condition where much of your alveoli are filled with fluid and oxygen can’t get to your bloodstream.
What is pulmonary fibrosis?
Areas of lung damage that turn into scarring. Scarring can continue to progress even after the infection is resolved.
What is long COVID?
Some people continue to experience symptoms for months or years after having COVID.
Who is at highest risk of severe COVID lung disease?
People over 65, pregnant people, current or former smokers, organ or stem cell transplant recipients, unvaccinated people, and those with a compromised immune system (from cancer, medications, HIV or primary immunodeficiency).
Which health conditions raise the risk of lung damage from COVID?
Cancer, chronic lung disease (asthma, COPD, cystic fibrosis), conditions affecting the heart/kidneys/liver/blood/brain, congenital conditions like cerebral palsy or Down syndrome, diabetes, mental health disorders, obesity and substance use disorders.
Does Omicron still cause lung damage?
Some data suggest Omicron variants more frequently cause upper respiratory infections than earlier versions — but they are still capable of causing lung damage and severe complications.
How is COVID lung damage diagnosed?
Providers use imaging (chest X-ray or CT scan) or a bronchoscopy (a lighted tube used to look inside your airways), plus other tests to diagnose infections like pneumonia.
What tests check my lungs after COVID?
Nasal swabs, pulse oximetry, chest X-rays, CT scans, blood tests, sputum tests, pleural fluid cultures, arterial blood gas tests and bronchoscopy.
What is a pulse oximetry test?
A sensor slips over your finger and measures the amount of oxygen in your blood, giving providers an idea of how well your lungs are working.
How do you treat COVID lung damage?
There aren’t many ways to treat lung damage after it has happened, but providers can supply the oxygen you need — supplemental oxygen, IV fluids, mechanical ventilation, proning, ECMO or fluid draining — plus medications to fight the infection.
What antivirals treat COVID?
Remdesivir or Paxlovid can help you fight off a COVID infection. Antivirals are most effective when taken within the first five days of symptoms.
When should antivirals be taken?
As soon as possible after testing positive — they are most effective within the first five days of symptoms, and taking them in the first five days of illness can keep you from getting severely ill.
What medications reduce lung inflammation from COVID?
Corticosteroids reduce swelling, and monoclonal antibody treatments such as tocilizumab can reduce or prevent inflammation. Antibiotics are used if a bacterial infection is also present.
What is proning?
Your provider may put you on your belly for several hours a day to help your lungs work more efficiently.
What is ECMO?
Extracorporeal membrane oxygenation — a type of life support that takes over the work of your heart and lungs if your organs aren’t working properly.
Can COVID lung damage require a lung transplant?
Rarely, people with lasting, severe lung damage from COVID have received a lung transplant. Some medications might slow down pulmonary fibrosis if it continues to worsen.
When should I go to the ER for COVID lung symptoms?
Call 911 or go to the emergency room for severe shortness of breath or difficulty breathing, confusion, inability to stay awake, or bluish skin, lips or nails.
When should I see my provider after COVID?
If symptoms like shortness of breath or tiredness persist, talk to your provider — designated long COVID clinics may help.
Can COVID lung damage be prevented?
The best prevention is avoiding infection: vaccination against COVID and flu, quitting smoking and avoiding secondhand smoke, handwashing, avoiding close contact and sharing items, and managing existing health conditions. Antivirals early in the illness also reduce the risk of severe disease.
Can I predict whether I’ll get severe COVID lung disease?
No. There’s no way to predict who will get severe or long-lasting illness and who will not.
Related Reading
Source
References
Medical Disclaimer
This content is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read here. In a medical emergency, call 911 or your local emergency number immediately.
Comments