What are some of the most telltale signs of pneumonia?

Pneumonia: Symptoms include fever, chills, chest pain (often pleuritic or pain with breathing in), cough, often productive of sputum, headache, shortness of breath, and signs include purulent sputum, fever, signs of consolidation on stethoscope auscultation, positive sputum cultures, elevated WBC counts, sputum gram's stains showing many leukocytes and bacteria, etc.

Pneumonia : Fever, chills, cough, chest pain, malaise, body aches, fatigue, loss of appetite etc.

Pneumonia.: Symptoms include cough, chest discomfort, shortness of breath, chills and sweats. Can develop quickly or can take some time, depending on the bacterium/virus involved. Signs include a measured fever and typical findings on a chest X-ray.