In fact, if the nose is swollen or inflamed, it is not recommended to use CPAP, but if it is really necessary. It is advisable to start with a gentle pressure first, and if it is an auto machine, set the maximum not too high, such as 10, etc., because the air from the CPAP machine is stronger than normal breathing. It may sting or inflame your nose. And having a blocked nose may cause the device to increase the pressure higher than it should be. Because I think it's caused by a blockage in the throat.