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  1. www.mayoclinic.org › pneumonia › symptoms-causesPneumonia - Symptoms and causes - Mayo Clinic

    Jun 13, 2020 · Pneumonia is an infection that inflames the air sacs in one or both lungs. The air sacs may fill with fluid or pus (purulent material), causing cough with phlegm or pus, fever, chills, and difficulty breathing. A variety of organisms, including bacteria, viruses and fungi, can cause pneumonia.

  2. my.clevelandclinic.org › health › diseasesPneumonia: Causes, Symptoms, Diagnosis & Treatment - Cleveland...

    Nov 15, 2022 · Pneumonia is inflammation and fluid in your lungs caused by a bacterial, viral or fungal infection. It makes it difficult to breathe and can cause a fever and cough with yellow, green or bloody mucus. The flu, COVID-19 and pneumococcal disease are common causes of pneumonia. Treatment depends on the cause and severity of pneumonia.

  3. www.lung.org › pneumonia › what-causes-pneumoniaWhat Causes Pneumonia? | American Lung Association

    Aug 3, 2023 · 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.

  4. www.nhlbi.nih.gov › health › pneumoniaPneumonia - Causes and Risk Factors | NHLBI, NIH

    Mar 24, 2022 · Risk factors. Your risk for pneumonia may be higher because of your age, environment, lifestyle habits, and other medical conditions. Age. Pneumonia can affect people of all ages. However, two age groups are at higher risk of developing pneumonia and having more serious pneumonia.

  5. www.healthline.com › health › pneumoniaPneumonia: Diagnosis, Symptoms, and Treatment - Healthline

    Jun 24, 2024 · Causes of pneumonia. Pneumonia happens when germs get into your lungs and cause an infection. The immune system’s reaction to clear the infection results in inflammation of the lung’s air...

  6. www.healthhub.sg › a-z › diseases-and-conditionsPneumonia - HealthHub

    Mar 5, 2022 · Pneumonia is a serious lung infection that can be caused by bacteria, viruses, fungi, or other factors. Learn how to recognise the signs of pneumonia, get vaccinated, and take precautions to prevent it.

  7. www.webmd.com › lung › understanding-pneumonia-basicsPneumonia: Symptoms, Causes, and Treatment - WebMD

    Apr 28, 2024 · Causes include bacteria, viruses, and fungi. If your pneumonia results from bacteria or a virus, you can spread it to someone else. Types of Pneumonia. Pneumonia can be grouped into types...

  8. www.who.int › health-topics › pneumoniaPneumonia - World Health Organization (WHO)

    Overview. More. Pneumonia is a form of acute respiratory infection that is most commonly caused by viruses or bacteria. It can cause mild to life-threatening illness in people of all ages, however it is the single largest infectious cause of death in children worldwide.

  9. www.hopkinsmedicine.org › conditions-and-diseases › pneumoniaPneumonia | Johns Hopkins Medicine

    Infectious Diseases. What is pneumonia? Pneumonia is an infection of one or both of the lungs caused by bacteria, viruses, or fungi. It is a serious infection in which the air sacs fill with pus and other liquid. Lobar pneumonia affects one or more sections (lobes) of the lungs.

  10. www.mayoclinic.org › diseases-conditions › pneumoniaPneumonia - Diagnosis and treatment - Mayo Clinic

    Jun 13, 2020 · Pneumonia can prevent your lungs from moving enough oxygen into your bloodstream. Sputum test. A sample of fluid from your lungs (sputum) is taken after a deep cough and analyzed to help pinpoint the cause of the infection.