With index finger, they can close their right nose and breathe through the left nose and breathe out to the left nose. Now, they can close their left nose and breathe in and breathe out through the left nose. If they’re having difficulty breathing through one side, that means they most likely have a deviated nasal septum. On the side where they have difficulty breathing, they can simply pull the nose outside by pulling on the cheek and if they’re able to breathe better, the deviated nasal septum diagnosis is confirmed.