The difference between upper respiratory tract infections and respiratory tract infections mainly lies in their different locations. The so-called upper respiratory tract infections are primarily confined to the upper respiratory tract, while respiratory tract infections include both upper and lower respiratory tract infections. Clinically, the main symptoms of upper respiratory tract infections include nasal congestion, runny nose, sneezing, itchy throat, coughing, etc.; whereas patients with lower respiratory tract infections often experience coughing, expectoration, shortness of breath, chest tightness, chest pain, and difficulty breathing. Patients with lower respiratory tract infections may also exhibit symptoms of upper respiratory tract infections.