Can flying affect your memory?

While many love the experience of travelling by flight, it can be a nightmare for others who often complain of experiencing jet lag, nausea, memory loss, or brain fog post their journey. Some studies show that even relatively mild levels of hypoxia (deficiency in oxygen) can alter our ability to think clearly.



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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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“At oxygen levels equivalent to altitudes above 12,000ft (3.6km), healthy adults can start to show measurable changes in their memory, their ability to perform calculations and make decisions,” BBC had reported earlier.

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The effects of flying on the human body vary from mild skin dryness to more severe problems like deafness. Flying increases the risk of catching a cold, dehydration, aging faster, reduced alertness, increased risk of diseases like cancer, fuzzy thinking, and many others.

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At these altitudes, there is a reduction of between 20 and 26% of available oxygen, resulting in haemoxyhaemoglobin saturations between 83 and 85% of normal. In fit people this can cause tachycardia, tachypnoea, headaches, dizziness, impaired coordination, fatigue and confusion.

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The rate of change in oxygen levels can affect physiological response. There is individual variation in physiological response to increasing altitude and in how people feel with reduced oxygen levels. Symptoms of altitude sickness include headache, nausea, vomiting, dizziness, fatigue and insomnia.

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For those who are already nervous fliers, there is perhaps some more bad news. “Anxiety levels can increase with hypoxia,” explains Valerie Martindale, president of the Aerospace Medical Association at King's College London. Anxiety is not the only aspect of mood that can be affected by flying.

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Jet lag is a temporary sleep disorder, but not temporary enough for many travelers. If you're flying from San Francisco to Rome for a 10-day trip, for example, it may take six to nine days to fully recover. That's because it can take up to a day for each time zone crossed for your body to adjust to the local time.

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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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How long jet lag lasts will depend on several factors. These include how far you traveled, your body's unique rhythms and your overall health. Many people who experience jet lag feel better a few days after arriving to their destination. For some people, it can take up to one week to feel fully back to themselves.

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Flying may be deliriogenic because of pressure changes, noise, humidity, and time shifts. For long flights, anticholinergic medications prescribed in anticipation of incontinence may worsen cognition or precipitate delirium.

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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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Air is actually less oxygen-dense at higher altitudes. Meaning the higher you go, the less oxygen will be available to you. While you may not consciously notice any trouble breathing, you are likely to feel drained and tired once you land at your destination.

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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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How to aid recovery from long-haul flights
  1. Avoid alcohol for at least 24 hours.
  2. Go for a short burst of cardio. ...
  3. Keep drinking water.
  4. Sleep, or if you can't sleep, rest in a darkened room very soon after arriving at your final destination.
  5. And finally, if you can, get a massage within the first 24 hours of landing.


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Simply being outside is ideal for clearing your head after being trapped on a plane, says Sebastien Maingourd, regional manager of Le Barthélemy Hotel and Spa in the French West Indies. He tells guests to take a walk or quick swim to feel rejuvenated. Refuel with something satisfying or healthy.

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The following day, you're tired and cranky – much worse than after any other travel day – even though you rested well on the plane itself. Commonly referred to as post-flight aches, these symptoms can be excruciating and keep you from moving around generally for a few days after your trip has ended.

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One in three people said that the most stressful part of travelling was during the flight, with a further 35% saying they found landing the most stressful. Boarding, finding your seat on the plane and the flight itself all came at the bottom of the list, making them the least stressful moments whilst travelling.

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