Pneumonia is a serious infection of the lungs that can cause difficulty breathing, chest pain, and fever. Symptoms of pneumonia include coughing, chest pain, fever, chills, shortness of breath, and difficulty breathing. Diagnosis of pneumonia usually involves a physical exam, chest X-ray, and laboratory tests. Treatment typically involves antibiotics, rest, and plenty of fluids. In severe cases, hospitalization may be necessary. Oxygen therapy may also be used in severe cases. In some cases, supportive treatments such as pulmonary toilet, physical therapy, and breathing exercises may be necessary.