Pneumonia is an infection in the lungs that causes cough with pus and fever. It is normally caused by bacteria, viruses and fungi. It is one of the illnesses that can go from mild to life-threatening. It is most serious for babies and children, people older than age 65 and people with health problems.
The symptoms vary from mild to severe, depending on what caused the infection and age and they are similiter to those of the flu, but they last longer. These symptoms include: chest pain when breathing or coughing, cough, fatigue, fever, chills, vomiting and shortness of breath.