Pneumonia
Pneumonia is an infection that causes inflammation of the air sacs within one or both lungs. It can be caused by bacteria, viruses, and other infectious organisms and can range from a relatively mild illness to a serious medical condition.
Symptoms may include:
Cough
Fever or chills
Shortness of breath
Chest discomfort or pain with breathing
Fatigue or weakness
Mucus or phlegm production
Loss of appetite