Pneumonia is an infection in which the sufferer’s lungs become inflamed. Pneumonia is most often caused by a virus or bacteria. It is sometimes caused by inhalation of chemical fumes or vomit. In every type of pneumonia, the inflamed lungs are filled with mucous and other liquids that prevent a person from breathing normally. Irregular breathing blocks oxygen from reaching blood and cells. If untreated, pneumonia may be fatal.SymptomsPneumatic symptoms sometimes occur during or after a person suffers from flu, cold, or other respiratory infections. The following are general symptoms of pneumonia:--A mucus-filled cough--Chills and shaking--Fever--Pain in the chest, especially while coughing and inhaling deeply--Vomiting and nausea--Diarrhea--Rapid heartbeat--Fatigue, malaise, lethargy--Sh