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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: Symptoms, Causes, and Treatment - WebMD
Pneumonia is a lung infection most often caused by bacteria or a virus. It may be mild enough that you can recover at home, or serious enough to put you in a hospital.
Pneumonia | CDC
Homepage for CDC's information on pneumonia, an infection of the lungs.
Pneumonia: Symptoms, Causes, and Treatment - Harvard Health
What is pneumonia? 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.
Pneumonia - Wikipedia
Pneumonia is an inflammatory condition of the lung primarily affecting the small air sacs known as alveoli. [3][13] Symptoms typically include some combination of productive or dry cough, chest pain, fever, and difficulty breathing. [14] . The severity of the condition is variable. [14]
What Is Pneumonia? - NHLBI, NIH
Learn about the causes, risk factors, signs and symptoms, and treatment for pneumonia.
Pneumonia - Johns Hopkins Medicine
The main types of pneumonia are bacterial, viral, and mycoplasma pneumonia. A cough that produces green, yellow, or bloody mucus is the most common symptom of pneumonia.
American Thoracic Society | Pneumonia: Symptoms, Treatment, and When…
Learn about pneumonia symptoms, causes, treatment, and when to seek medical care. Find tips to recover and prevent complications.
Top 10 Early Warning Signs of Pneumonia (2026) - Respiratory Therapy Zone
Explore the early warning signs and symptoms of pneumonia to detect this serious lung infection, improving recovery and overall health.
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