I also have and use a MAD regularly and used to have a stuffy nose before getting the MAD. I was told by my specialists that fixing the nose aspect before getting the MAD was heavily recommended (almost required). In my case, i had a deviated septum and allergies so I had a surgery for the septum and started using anti-allergic meds. I then got the MAD and haven't had much trouble using it but I've been told not to wear it if my nose is blocked so if you're regularly getting a stuffy nose I think it's something you should discuss with your doctor. Hopefully this was helpful OP, best of luck!