Nasal congestion after catching a cold may be related to upper respiratory tract infection, or may be caused by vasomotor rhinitis or chronic sinusitis. 1. Upper respiratory tract infection: after the body catching a cold is likely to induce upper respiratory tract infection, and upper respiratory tract infection is usually caused by viral infections, when the pathogen invades the patient’s respiratory tract, it is likely to lead to respiratory mucosal congestion, edema, and secretion will increase significantly, there may be nasal congestion, resulting in nasal congestion when catching a cold. 2. vasomotor rhinitis: if this disease exists, when the cold is easy to trigger the onset of symptoms, resulting in an increase in nasal secretions, which will cause nasal congestion, may also be accompanied by runny nose, sneezing and other manifestations. 3. Chronic sinusitis: patients with a history of chronic sinusitis are prone to a significant increase in nasal secretions after catching a cold, resulting in poor ventilation in the nose, thus causing nasal congestion when cold. Nasal congestion in the cold may also be caused by other reasons, if the symptoms are more serious, or accompanied by other discomforts, it is recommended to consult a doctor as soon as possible, after diagnosis and standardized treatment in accordance with the doctor’s instructions.