Nasal congestion on one side of the nose needs to be treated according to its causes, such as nasal infection, nasal foreign body, deviated septum, etc. After clear diagnosis, general treatment, medication or surgical treatment will be chosen. 1. Nasal infection: Nasal infection can cause nasal congestion on one side of the nose, and may also be accompanied by the phenomenon of runny nose. Treatment can be prescribed anti-infective, anti-allergic, anti-viral drugs, such as loratadine, amoxicillin, acyclovir, according to their pathogens to choose the right drug. 2. Nasal foreign body: foreign body entering into one side of the nose can also cause one side of the nose not ventilated nasal congestion. Treatment can be through physiological sea saline rinse nasal foreign body, if necessary, can go to the hospital to let the professional doctor to remove the foreign body. 3. Deviated septum: Deviated septum can also cause nasal congestion on one side of the nose, for which surgical treatment can be chosen to improve the phenomenon of deviated septum. There are many reasons for nasal congestion on one side of the nose, if the long time no ventilation, it is recommended to go to the hospital in a timely manner, in accordance with the doctor’s instructions to take standardized treatment, the drug should be used under the guidance of the doctor, not to be used indiscriminately, so as not to lead to adverse consequences.