Bag breathing can fix hiccups (co2)
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Bag breathing in a 20L bag for 3-4 minutes raised co2 and ended the hiccups. plastic bag i imagine paper is better for u regularly if its well sealed
https://pubmed.ncbi.nlm.nih.gov/29729130/
yerrag posted this on the old forum,
and settled on breathing in 10% co2 gas instead to fix them