A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Be a fan on Facebook Read our blog Follow us on Twitter Add our widgetPneumonia is an inflammation of the lungs that is usually caused by infection. viagra Though it has since become very treatable, pneumonia remains a public health problem. viagra Before the invention of antibiotics in the 1930s, pneumonia was a leading cause of death. viagra With pneumonia, the air sacs in the lungs fill with liquid or pus, which interferes with the lungs' ability to transfer oxygen to the blood. viagra Pneumonia can also be caused by inhaling irritants such as vomit, liquids, or chemicals.