It may be that hiccups are caused by low levels of CO₂, so raising this will inhibit the hiccups, or some think it's a way of distracting ... obvious many of these ‘cures’ don’t have ...
Common ways to stop hiccups fast are to try deep breathing or to hold your breath ... they can be distressing when experiencing them for any length of time or in an inconvenient location. Fortunately, ...