3. Coughing
Coughing, coughing, coughing. Because the pneumonia infection takes up residence in the lungs, this is where the frontline of the battle commences. As a result, phlegm and mucus build-up, and coughing is one of the most common signs of the disease.
Be aware that coughing alone can be synonymous with many other conditions and infections, so always cross-reference it with any other symptoms you (or the patient) are displaying. Coughing may sometimes produce yellow or green mucus in the process of clearing the accumulation in the lungs.
A sore throat can also be present, though not always, and can get worse over time if aggravated by coughing.