Is it true that you only snore when on your back?
No. This is not true, but snoring definitely occurs more often when someone sleeps on their back and often people are recommended to try a different position.
That said people have been known to snore:
- In any position
- Even when in sitting position
- When sleeping on specifically one side
Snoring exists due to a blockage or a reduction in the air pathway and can be nasal or from mouth/throat, so any position which worsens the blockage will cause more snoring and any position with alleviates the obstruction will reduce or eliminate the snoring.