Nasal congestion and runny nose are common in common cold, allergic rhinitis, sinusitis and nasal polyps. 1. Common cold: caused by viral infection, in addition to nasal congestion and runny nose, common cold can also be manifested as sneezing, coughing and other symptoms. 2. Allergic rhinitis: caused by contact with allergens, in addition to nasal congestion and runny nose, it can also manifest as paroxysmal sneezing and nasal itching symptoms. 3. Sinusitis: If the nasal discharge is purulent and accompanied by fever, loss of smell, headache and other symptoms, it is suspected to have sinusitis. 4. Nasal polyps: Nasal polyps can also cause nasal congestion and runny nose, manifested by persistent nasal congestion, and may also have facial pain. If the symptoms of long-term nasal congestion and runny nose appear, it is recommended to go to the hospital in time for consultation and targeted treatment.