Pneumonia is an inflammation of one or both lungs, typically due to a bacterial, viral, or fungal infection. With pneumonia, the tiny air sacs inside the lungs fill with fluid or pus, leading to ...

Pneumonia is a common but often severe respiratory infection. According to the American Thoracic Society, in the United States alone, around 1 million adults are hospitalized with pneumonia every year ...

Walking pneumonia has milder symptoms than pneumonia but can take longer to resolve. Most people recover from bacterial and viral pneumonia in less than a week. Severely ill people may take longer to ...