Does blood pressure affect flying?

A 2021 study states that people with high blood pressure can travel to high altitudes unless they have uncontrolled blood pressure or heart problems. In these situations, it is essential to talk with their doctor, who can advise them on how to travel by air safely.



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If your blood pressure is elevated and you want to see an immediate change, lie down and take deep breaths. This is how you lower your blood pressure within minutes, helping to slow your heart rate and decrease your blood pressure. When you feel stress, hormones are released that constrict your blood vessels.

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Prevention
  1. Yawn and swallow during ascent and descent. ...
  2. Use the Valsalva maneuver during ascent and descent. ...
  3. Don't sleep during takeoffs and landings. ...
  4. Reconsider travel plans. ...
  5. Use an over-the-counter nasal spray. ...
  6. Use decongestant pills cautiously. ...
  7. Take allergy medication. ...
  8. Try filtered earplugs.


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Flying does two things that are relevant to dizziness-- it may induce motion sickness, and it may stimulate the ear through pressure changes. There is a small literature about alternobaric vertigo. In small planes, dizziness may come from either or both mechanisms.

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Air travel increases the risk of developing blood clots in the veins of the legs, which can then enter the bloodstream and block an artery in the lungs, a condition called pulmonary embolism. In some cases, the opening can allow the blood clot to enter the arteries of the brain, causing a stroke.

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At sea level, oxygen saturation hovers around 98 to 100 percent, but at 14,000 feet, the saturation levels drops to 80 percent due to oxygen-poor air, requiring the heart to increase cardiac output, requiring a 10 to 30 percent increase in heart rate to maintain appropriate oxygen delivery to tissues.

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Hypoxia and increased sympathetic activation may increase the risk of cardiac arrhythmias at high altitude2; however, the incidence of significant arrhythmias during air travel is rare.

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