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Pneumonia - Symptoms and causes - Mayo Clinic
Pneumonia — Learn about the symptoms, causes and treatment of this serious lung infection.
Pneumonia: Causes, Symptoms, Diagnosis & Treatment
Pneumonia is a lung infection caused by bacteria, viruses or fungi. Fluid and inflammation in your lungs makes breathing hard and causes fever and other symptoms.
Pneumonia - Wikipedia
move to sidebarhide. (Top) 1Signs and symptoms. 2Cause. Toggle Cause subsection. 2.1Bacteria. 2.2Viruses. 2.3Fungi. 2.4Parasites. 2.5Noninfectious. 3Mechanisms. Toggle Mechanisms subsection.
What Is Pneumonia? Types, Causes, Signs, and Treatments - WebMD
Pneumonia causes lung inflammation and severe respiratory symptoms. WebMD outlines the underlying causes, diagnostic tests, and available treatments for relief.
Pneumonia | CDC
Many professional organizations have issued guidelines to manage and prevent pneumonia. Learn More Feb. 25, 2026 Pneumonia Pneumonia is a lung infection that can be caused by many germs. Treatment and prevention options and who's at risk vary by cause. View All For Everyone
About Pneumonia | Pneumonia | CDC
Many different bacteria, fungi, and viruses can cause pneumonia (a lung infection).
Pneumonia - NHS
Find out about pneumonia, including what the symptoms are, where to get medical help, what the treatments are, what causes it and how to prevent it.
Pneumonia - What Is Pneumonia? | NHLBI, NIH
Pneumonia is a lung infection that causes your air sacs to fill up with fluid or pus. Learn about the causes, risk factors, signs and symptoms, and treatment for pneumonia.
Pneumonia: Diagnosis, Symptoms, and Treatment - Healthline
Pneumonia is an infection of the lungs caused by fungi, bacteria, or viruses. General symptoms include chest pain, fever, cough, and trouble breathing.
Pneumonia: Symptoms, Causes, and Treatment - Harvard Health
Pneumonia is an infection of one or both lungs that triggers inflammation and causes the air sacs (alveoli) of the lung to fill with pus or liquid. Symptoms include coughing, shortness of breath, and fever, and can be mild to life-threatening.
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