Nasal congestion when catching a cold is a common symptom in daily life, mainly caused by viral infections due to exposure to cold. Common viruses include Coxsackievirus, influenza virus, and parainfluenza virus, all of which can lead to a cold. In addition to nasal congestion, patients with a cold usually also experience clear watery nasal discharge, sneezing, headache, fever, and fatigue among other clinical manifestations. When these symptoms occur, we can first complete a routine blood test and C-reactive protein test. A significant increase in the percentage of lymphocytes may be seen in patients with viral infections. Under the guidance of a physician, antiviral medications and symptomatic treatment drugs that clear the orifices can be used. The patient's symptoms can generally improve gradually within 5-7 days.