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This is caused by an infection of one or both of the lungs. Common signs/symptoms are coughing, mucus, fever, chest pain, severe chills, shortness of breath, chest pain that is sharp and pleuritic (worsens on inhalation), headache, sweaty/pale skin, fatigue, confusion, etc. You may hear crackles when you auscultate. Depending on the stage this may not require hospitalization but can also be life threatening--especially to the chronically ill or elderly.
What is pneumonia?