Moglman
Mountain Hound
What I learned a long time ago from that liberal pre-med commune I called college, was that hiccups are caused by excess oxygen in the bloodstream. The reason many cures work (breathing into a bag, long drink of water, etc...) is that they force either the holding of the breath, slowed breathing, or in some manner increase the levels of CO2 in the blood. My 2¢.