Snoring is just noisy breathing, caused by the soft tissues of your nose or upper airways vibrating when you're drowsy or asleep. Anything that partly blocks those airways, or makes them more floppy and prone to collapsing down on each other, increases your risk of snoring.
This is a companion discussion topic for the original article at https://patient.info/features/healthy-living/how-to-stop-snoring-wrecking-your-sleep