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Why is a paper bag used when treating hyperventilation?

Answer:

The major symptoms caused by hyperventilation are caused by the decrease in arterial carbon dioxide (CO2) caused by hyperventilation. Breathing into a bag causes you to rebreathe CO2 and raise the CO2 level, which causes the symptoms to go away. The danger of this is that you can actually raise the CO2 level too much and cause other problems.

First answer by DeLaughterDO. Last edit by DeLaughterDO. Contributor trust: 364 [recommend contributor recommended]. Question popularity: 3 [recommend question].