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| URL | https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/learn-about-pneumonia |
| Last Crawled | 2026-04-16 08:30:09 (1 day ago) |
| First Indexed | 2020-03-24 05:51:17 (6 years ago) |
| HTTP Status Code | 200 |
| Meta Title | What Is Pneumonia & Who Is at Risk? | American Lung Association |
| Meta Description | Pneumonia is an infection in one or both lungs that can cause mild to serious illness. It is commonly spread by germs we breathe. Anyone can get pneumonia, but some people are at increased risk. |
| Meta Canonical | null |
| Boilerpipe Text | Key Facts
Bacteria and viruses (like the flu, the virus that causes COVID-19 and RSV) are common causes of pneumonia, a lung infection.
While anyone can develop pneumonia, age, underlying medical conditions and behavioral factors can increase a person’s risk.
There are vaccines available to help prevent pneumonia.
What Is Pneumonia?
Pneumonia is an infection in one or both of the lungs that may be caused by bacteria, viruses, or fungi. The infection causes the lungs' air sacs (alveoli) to become inflamed and fill up with fluid or pus. That can make it hard for the oxygen you breathe in to get into your bloodstream. The symptoms of pneumonia can range from mild to severe, and include cough, fever, chills, and trouble breathing.
Many factors affect how serious a case of pneumonia is, such as the type of germ causing the lung infection, the person’s age, their overall health and their behaviors. The people most at risk are infants and young children, adults 65 or older with risk increasing as age increases, and people who have chronic (long-term) medical conditions and weakened immune systems.
Pneumonia is a leading cause of hospitalization in both children and adults. Most cases can be treated successfully, although it can take weeks to fully recover. Tens of thousands of people in the U.S. die from pneumonia every year, most of them adults over the age of 65.
What Causes Pneumonia?
Pneumonia can be caused by a wide variety of bacteria, viruses and fungi in the air we breathe. Identifying the cause of your pneumonia can be an important step in getting the proper treatment.
Learn about germs that cause pneumonia
.
Who Is At Risk for Pneumonia?
Anyone can get pneumonia, and it can cause mild to serious illness in people of any age. However, there are factors that can increase your chances of getting sick and having a more severe illness. One of the most important factors is your age. People who are age 65 and over are at increased risk because their immune system is becoming less able to fight off infection as years go by. Infants and children two years of age or younger are also at increased risk because their immune systems are not yet fully developed.
Other risk factors can be grouped into three main categories: medical conditions, health behaviors, and environment.
Medical Conditions
Chronic lung diseases such as
COPD
,
asthma
,
bronchiectasis
, or
cystic fibrosis
that make the lungs more vulnerable.
Other serious chronic illnesses, such as heart disease, liver disease, diabetes and sickle cell disease.
A weakened immune system due to HIV/AIDs, an organ transplant, chemotherapy or long-term steroid use.
Difficulty swallowing, due to stroke, dementia, Parkinson's disease, or other neurological conditions, which can result in aspiration of food, vomit or saliva into the lungs that then becomes infected.
Recent illness from a respiratory virus—a
cold
,
RSV
,
influenza
, etc.
Hospitalization, especially when in intensive care and using a ventilator to breathe.
Health Behaviors
Cigarette smoking, which damages the lungs.
Having an alcohol or substance use disorder.
Environment
Exposure to certain chemicals, pollutants or toxic fumes, including
secondhand smoke
.
Being around people who are sick.Â
Living in a long-term care facility.
There are more germs causing respiratory illness circulating in the fall and winter, this causes more spread of respiratory illnesses within communities. People can get pneumonia at any time of the year though.
Page last updated: December 10, 2025 |
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# Learn About Pneumonia
Pneumonia is an infection in one or both lungs that can cause mild to serious illness. It is commonly spread by germs we breathe. Anyone can get pneumonia, but some people are at increased risk.
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[Pneumonia](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia)
- [Learn About Pneumonia](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/learn-about-pneumonia)
- [What Causes Pneumonia](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/what-causes-pneumonia)
- [Pneumonia Symptoms and Diagnosis](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/symptoms-and-diagnosis)
- [Pneumonia Treatment and Recovery](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/treatment-and-recovery)
- [Preventing Pneumonia](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/preventing-pneumonia)
- [Pneumococcal Pneumonia](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/pneumococcal)
- [Walking Pneumonia](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/walking-pneumonia)
## Key Facts
- Bacteria and viruses (like the flu, the virus that causes COVID-19 and RSV) are common causes of pneumonia, a lung infection.
- While anyone can develop pneumonia, age, underlying medical conditions and behavioral factors can increase a person’s risk.
- There are vaccines available to help prevent pneumonia.
1\.4 Million Emergency department visits with pneumonia
Over 40,000 Deaths due to pneumonia
23% Of adults 19-64 at increased risk received pneumococcal vaccination
[ iframe video](https://www.youtube.com/embed/gPOFtuDmjhI?si=vMRMjf2uk-tytAHX)
Understanding Pneumonia
[Watch Video](https://www.youtube.com/embed/gPOFtuDmjhI?si=vMRMjf2uk-tytAHX)
Transcript
Pneumonia is an infection of the lungs that you can get in your community or in a healthcare setting. When you have pneumonia, the air sacks in your lungs swell and fill with fluid or pus.
Pneumonia is commonly caused by bacteria and viruses and less frequently by fungi. The bacteria and viruses that cause pneumonia are contagious. You can get pneumonia after an infected individual coughs, sneezes, or you're in close contact with them.
When you have pneumonia, common symptoms include chest pain, cough, fever, or chills, feeling tired, and rapid or difficulty breathing. Symptoms can vary depending on your age, what caused you to have pneumonia, and your overall health.
Pneumonia can cause anyone to have mild to serious illness. However, some people are at increased risk. Those at increased risk include older adults, young children, those with long-term medical conditions like chronic lung disease, diabetes, and weakened immune systems, and individuals who smoke cigarettes.
Immunizations help prevent infection by some bacteria and viruses that can cause pneumonia. It is important to stay up to date on immunizations recommended for you. Also, don't forget to wash your hands, keep your distance from people who are sick if you can. Disinfect frequently touched surfaces and avoid cigarette smoke. Finally, keep your long-term medical conditions like asthma and COPD well managed. Learn more at lung.org/pneumonia.
[Watch in Spanish](https://youtu.be/Odgyau2UoBQ?si=sS6Ho2Cdz2wbvEfc)
## What Is Pneumonia?
Pneumonia is an infection in one or both of the lungs that may be caused by bacteria, viruses, or fungi. The infection causes the lungs' air sacs (alveoli) to become inflamed and fill up with fluid or pus. That can make it hard for the oxygen you breathe in to get into your bloodstream. The symptoms of pneumonia can range from mild to severe, and include cough, fever, chills, and trouble breathing.
Many factors affect how serious a case of pneumonia is, such as the type of germ causing the lung infection, the person’s age, their overall health and their behaviors. The people most at risk are infants and young children, adults 65 or older with risk increasing as age increases, and people who have chronic (long-term) medical conditions and weakened immune systems.
Pneumonia is a leading cause of hospitalization in both children and adults. Most cases can be treated successfully, although it can take weeks to fully recover. Tens of thousands of people in the U.S. die from pneumonia every year, most of them adults over the age of 65.
## What Causes Pneumonia?
Pneumonia can be caused by a wide variety of bacteria, viruses and fungi in the air we breathe. Identifying the cause of your pneumonia can be an important step in getting the proper treatment.
[Learn about germs that cause pneumonia](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/what-causes-pneumonia).

## Who Is At Risk for Pneumonia?
Anyone can get pneumonia, and it can cause mild to serious illness in people of any age. However, there are factors that can increase your chances of getting sick and having a more severe illness. One of the most important factors is your age. People who are age 65 and over are at increased risk because their immune system is becoming less able to fight off infection as years go by. Infants and children two years of age or younger are also at increased risk because their immune systems are not yet fully developed.
Other risk factors can be grouped into three main categories: medical conditions, health behaviors, and environment.
- [Medical Conditions](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/learn-about-pneumonia#63181)
- [Health Behaviors](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/learn-about-pneumonia#63182)
- [Environment](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/learn-about-pneumonia#63183)
[Medical Conditions](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/learn-about-pneumonia#63181)
- Chronic lung diseases such as [COPD](https://www.lung.org/lung-health-diseases/lung-disease-lookup/copd), [asthma](https://www.lung.org/lung-health-diseases/lung-disease-lookup/asthma), [bronchiectasis](https://www.lung.org/lung-health-diseases/lung-disease-lookup/bronchiectasis), or [cystic fibrosis](https://www.lung.org/lung-health-diseases/lung-disease-lookup/cystic-fibrosis) that make the lungs more vulnerable.
- Other serious chronic illnesses, such as heart disease, liver disease, diabetes and sickle cell disease.
- A weakened immune system due to HIV/AIDs, an organ transplant, chemotherapy or long-term steroid use.
- Difficulty swallowing, due to stroke, dementia, Parkinson's disease, or other neurological conditions, which can result in aspiration of food, vomit or saliva into the lungs that then becomes infected.
- Recent illness from a respiratory virus—a [cold](https://www.lung.org/lung-health-diseases/lung-disease-lookup/facts-about-the-common-cold), [RSV](https://www.lung.org/lung-health-diseases/lung-disease-lookup/rsv), [influenza](https://www.lung.org/lung-health-diseases/lung-disease-lookup/influenza), etc.
- Hospitalization, especially when in intensive care and using a ventilator to breathe.
[Health Behaviors](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/learn-about-pneumonia#63182)
- Cigarette smoking, which damages the lungs.
- Having an alcohol or substance use disorder.
[Environment](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/learn-about-pneumonia#63183)
- Exposure to certain chemicals, pollutants or toxic fumes, including [secondhand smoke](https://www.lung.org/quit-smoking/smoking-facts/health-effects/secondhand-smoke).
- Being around people who are sick.
- Living in a long-term care facility.
- There are more germs causing respiratory illness circulating in the fall and winter, this causes more spread of respiratory illnesses within communities. People can get pneumonia at any time of the year though.
*Page last updated: December 10, 2025*
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| Readable Markdown | ## Key Facts
- Bacteria and viruses (like the flu, the virus that causes COVID-19 and RSV) are common causes of pneumonia, a lung infection.
- While anyone can develop pneumonia, age, underlying medical conditions and behavioral factors can increase a person’s risk.
- There are vaccines available to help prevent pneumonia.
## What Is Pneumonia?
Pneumonia is an infection in one or both of the lungs that may be caused by bacteria, viruses, or fungi. The infection causes the lungs' air sacs (alveoli) to become inflamed and fill up with fluid or pus. That can make it hard for the oxygen you breathe in to get into your bloodstream. The symptoms of pneumonia can range from mild to severe, and include cough, fever, chills, and trouble breathing.
Many factors affect how serious a case of pneumonia is, such as the type of germ causing the lung infection, the person’s age, their overall health and their behaviors. The people most at risk are infants and young children, adults 65 or older with risk increasing as age increases, and people who have chronic (long-term) medical conditions and weakened immune systems.
Pneumonia is a leading cause of hospitalization in both children and adults. Most cases can be treated successfully, although it can take weeks to fully recover. Tens of thousands of people in the U.S. die from pneumonia every year, most of them adults over the age of 65.
## What Causes Pneumonia?
Pneumonia can be caused by a wide variety of bacteria, viruses and fungi in the air we breathe. Identifying the cause of your pneumonia can be an important step in getting the proper treatment.
[Learn about germs that cause pneumonia](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/what-causes-pneumonia).
## Who Is At Risk for Pneumonia?
Anyone can get pneumonia, and it can cause mild to serious illness in people of any age. However, there are factors that can increase your chances of getting sick and having a more severe illness. One of the most important factors is your age. People who are age 65 and over are at increased risk because their immune system is becoming less able to fight off infection as years go by. Infants and children two years of age or younger are also at increased risk because their immune systems are not yet fully developed.
Other risk factors can be grouped into three main categories: medical conditions, health behaviors, and environment.
[Medical Conditions](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/learn-about-pneumonia#63181)
- Chronic lung diseases such as [COPD](https://www.lung.org/lung-health-diseases/lung-disease-lookup/copd), [asthma](https://www.lung.org/lung-health-diseases/lung-disease-lookup/asthma), [bronchiectasis](https://www.lung.org/lung-health-diseases/lung-disease-lookup/bronchiectasis), or [cystic fibrosis](https://www.lung.org/lung-health-diseases/lung-disease-lookup/cystic-fibrosis) that make the lungs more vulnerable.
- Other serious chronic illnesses, such as heart disease, liver disease, diabetes and sickle cell disease.
- A weakened immune system due to HIV/AIDs, an organ transplant, chemotherapy or long-term steroid use.
- Difficulty swallowing, due to stroke, dementia, Parkinson's disease, or other neurological conditions, which can result in aspiration of food, vomit or saliva into the lungs that then becomes infected.
- Recent illness from a respiratory virus—a [cold](https://www.lung.org/lung-health-diseases/lung-disease-lookup/facts-about-the-common-cold), [RSV](https://www.lung.org/lung-health-diseases/lung-disease-lookup/rsv), [influenza](https://www.lung.org/lung-health-diseases/lung-disease-lookup/influenza), etc.
- Hospitalization, especially when in intensive care and using a ventilator to breathe.
[Health Behaviors](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/learn-about-pneumonia#63182)
- Cigarette smoking, which damages the lungs.
- Having an alcohol or substance use disorder.
[Environment](https://www.lung.org/lung-health-diseases/lung-disease-lookup/pneumonia/learn-about-pneumonia#63183)
- Exposure to certain chemicals, pollutants or toxic fumes, including [secondhand smoke](https://www.lung.org/quit-smoking/smoking-facts/health-effects/secondhand-smoke).
- Being around people who are sick.
- Living in a long-term care facility.
- There are more germs causing respiratory illness circulating in the fall and winter, this causes more spread of respiratory illnesses within communities. People can get pneumonia at any time of the year though.
*Page last updated: December 10, 2025* |
| Shard | 120 (laksa) |
| Root Hash | 12972902985515685920 |
| Unparsed URL | org,lung!www,/lung-health-diseases/lung-disease-lookup/pneumonia/learn-about-pneumonia s443 |