Does flying put pressure on your brain?

During decrease in ambient external pressure (as in an aircraft cabin during ascent in flight) and given unchanged temperature, intracranial gas volume will increase. As intracranial gas volume increases, this will also lead to an increase in ICP, as long as the dura mater and/or calvarium is intact.



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At high altitudes, cerebral hypoxia triggers the upregulation of VEGF. In turn, the VEGF increases capillary permeability and contributes to cerebral edema. Note, however, that brain swelling attributable to ascent to high altitudes may occur without any associated symptoms.

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The Valsalva Maneuver
  1. Close your mouth.
  2. Squeeze the nostrils closed with one finger.
  3. Gently attempt to exhale out of your nose while keeping your nose pinched and mouth closed.
  4. Continue until you relieve the pressure.


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It is well known that imbalance between atmospheric pressure changes and pressure inside the sinuses can cause tissue damage [43–45]. This means, for example, that the pressure in the sinuses is lower than the cabin pressure during the landing [6, 26]. At take-off, the cabin pressure is lower than the sinuses [6, 26].

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Plane travel makes jet lag worse because your body moves much faster than your brain and circadian rhythms can process the time change. Other aspects of travel can also contribute to jet lag and may make symptoms worse: Long periods of sitting on a plane. Lack of oxygen and decreased air pressure in the airplane cabin.

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The cramped conditions and long periods of being less active on a flight can cause pain, stiffness or swelling of your legs. Being less active can lead to slow blood flow in your veins which increases your risk of developing a blood clot, known as deep vein thrombosis (DVT). DVTs most commonly form in the legs.

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Airplane headache (AH) is an intense, short lasting headache - usually lasts around 30 min [1], and is exclusively related to airplane travels.

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The main aspect of in-flight health that most of us will encounter is tiredness and changes to circadian rhythms. Flying often involves getting up at unsociable hours, inadequate sleep and messing up the body clock — all of which leave us more susceptible to being hit nastily by any bugs that may be floating about.

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Flying is a stressful experience
Air travel is stressful even under the best of circumstances, and a large part of that comes from having to relinquish control, which happens long before you reach the plane seat. Upon entering an airport, you are sifted through a regimented, mandatory, and inconvenient set of steps.

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Interestingly, large systemic studies point to a surprisingly low association between AHs and other diagnoses, such as migraine headaches, tension headaches, and chronic sinus allergies. There is also no documented association between AHs and any adverse health risks. Some patients are especially prone to AH.

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Remember that anything over 6 hours flying time is considered long haul, but flights of longer than 10 hours are not uncommon either. One important thing to remember is to keep your seat belt fastened at all times in case of unexpected turbulence.

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If your blood pressure is higher than 120 over 80, seek medical advice before you travel.

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