Final answer:
The common symptoms of respiratory infections include lack of appetite, nasal discharge, and weight loss. Common respiratory infections include rhinitis, sinusitis, pharyngitis, and laryngitis.
Step-by-step explanation:
Common symptoms of respiratory infections include lack of appetite, nasal discharge, and weight loss. These symptoms are often indicative of respiratory infections such as rhinitis, sinusitis, pharyngitis, and laryngitis. Rhinitis is an inflammation of the nasal cavities, sinusitis is an inflammation of the sinuses, pharyngitis is a sore throat, and laryngitis is an inflammation of the larynx.