If the patient has nasal congestion caused by cold and flu, it can be relieved by the following methods: 1) Quickly put drops of medicine in the nasal cavity, and use ephedrine nasal drops, which is the fastest way to relieve the nasal congestion. 2) You can also relieve the nasal congestion by taking certain anti-cold and flu medicines, such as Sensodyne, Contac, etc. 3) If the cold and flu are serious, and combined with viral infections, you can also take antiviral medicines such as oseltamivir, etc. 4) You can also use antiviral medicines such as oseltamivir. If the cold and flu are serious and combined with viral infections, you can also take antiviral drugs such as oseltamivir. If the nasal congestion is obvious, you can also go to the hospital for physical therapy, such as ultrashort wave and microwave treatment outside the nasal cavity, which can quickly relieve nasal congestion. 4, you can use a towel to apply hot compresses outside the local nasal cavity, which can also quickly relieve nasal congestion.