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SESK: Stuff Everyone Should Know · sesk.info/ifr-hyperventilation-co2

Hyperventilation under stress causes symptoms by blowing off too much of which gas?

Carbon dioxide.

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  1. Oxygen
  2. Carbon dioxide ✔
  3. Nitrogen

Why: Fast, deep breathing removes too much carbon dioxide, causing lightheadedness, tingling and coolness. Symptoms ease within a few minutes once you slow your breathing.

Huh, didn't know that: The AIM mentions breathing in and out of a paper bag to speed the buildup of carbon dioxide.

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References

Answer: Carbon dioxide. Fast, deep breathing removes too much carbon dioxide, causing lightheadedness, tingling and coolness. Symptoms ease within a few minutes once you slow your breathing.

  1. FAA Aeronautical Information Manual 8-1 Medical Facts for Pilots www.faa.gov/air_traffic/publications/atpubs/aim_html/chap8_section_1.html
    As hyperventilation “blows off” excessive carbon dioxide from the body
    Checked 2026-10-10.

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