An upper respiratory infection (URI) affects the upper parts of the respiratory system, including the nose, sinuses, throat, and larynx. Common types include the common cold, sinusitis, pharyngitis (sore throat), and laryngitis, often caused by viruses or bacteria. Symptoms typically include nasal congestion, sore throat, cough, and sometimes fever. URIs are usually mild and self-limiting, with treatment focused on relieving symptoms through rest, fluids, and over-the-counter medications #upperr