Does cabin pressure affect blood pressure?

Does flying affect blood pressure? Yes it can. At high altitudes, even in a pressurised aircraft cabin, passengers are at risk of hypoxaemia (low oxygen concentration in the blood).



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recent operation or injury where trapped air or gas may be present in the body (e.g. stomach ,bowel, eyes, face, brain) severe long term diseases that affect your breathing. breathlessness at rest. unresolved pneumothorax (punctured lung)

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Who should not travel by air? Diseases that prevent you from boarding a plane
  • Chronic obstructive pulmonary disease (COPD)
  • A recent stroke.
  • Infectious diseases, such as chickenpox, influenza or even COVID-19.
  • A recent surgery.
  • A pregnancy of over 28 weeks.
  • Angina (chest pain at rest)


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These include any hormone-based drugs, like the contraceptive pill and some fertility medicines, and drugs used to prevent heart attack and stroke. Antihistamines should also not be used to help passengers sleep during a flight.

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This valve controls the cabin pressure and also acts as a safety relief valve, in addition to other safety relief valves. If the automatic pressure controllers fail, the pilot can manually control the cabin pressure valve, according to the backup emergency procedure checklist.

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