Pneumonia, an infection of the lungs, can leave you very sick. You may experience symptoms including a cough, fever, and difficulty breathing. Symptoms can be mild to severe. Those already sick, babies, and seniors are more likely to experience severe pneumonia. Diagnosis will require a physical examination by a doctor and may call for chest x-rays or blood tests. Pneumonia is treatable. Antibiotics may be used to treat bacterial pneumonia and prevent complications from viral ...