" Pneumonia is an infection which affects the lungs. It can leave you very sick. Symptoms of Pneumonia include coughing, fever, and difficulty breathing. Symptoms and illness can vary from mild to severe. Older adults, babies, and those with chronic health problems are more likely to experience severe pneumonia. Diagnosis is completed by a doctor who performs an examination including a chest x-ray and/or blood tests. Pneumonia is treatable. Bacterial pneumonia is treated with antibiotics ...