According to the American Lung Association , ' Pneumonia is an infection of the lungs that may be caused by bacteria, viruses, or fungi. The infection causes the lungs' air sacs (alveoli) to become inflamed and fill up with fluid or pus. That can make it hard for the oxygen you breathe in to get into your bloodstream. The symptoms of pneumonia can range from mild to severe, and include cough, fever, chills, and trouble breathing.' Pneumonia Infographic Patients with pneumonia could have the following symptoms: Cough that produces phlegm or sometimes blood Fever Shortness of breath or difficulty breathing Chills or shaking Fatigue Sweating Chest or muscle pain If a person is suspected of having pneumonia, a doctor will begin by asking the patient about their medical history and symptoms. Next will be a physical exam, so the doctor can listen to the patient's lungs. In checking for pneumonia, a doctor will listen for abnormal sounds like crackling, rumbling or wheezing. I...