Cold, also known as upper respiratory tract infection, manifests clinically in patients with varying degrees of nasal congestion, runny nose, and sneezing. It's important first to identify the upper respiratory tract infection, which is mainly caused by a viral infection that leads to symptoms like nasal congestion, runny nose, sneezing, and sometimes a sore throat. For viral infections causing inflammatory lesions in the respiratory tract, in cases where the patient's immune function is strong, the symptoms of nasal congestion caused by the viral cold can resolve on their own. However, in infants or elderly people with lower immune function, when a viral cold occurs, symptomatic treatment with antiviral drugs can lead to a quicker recovery.