Traveling With a Chronic Illness: Flying, Packing, and Preventing Flares

For a lot of people, travel means excitement and a bit of pre-trip stress. For someone with POTS, MCAS or another chronic condition, it can feel more like an endurance event that requires weeks of preparation and recovery — not because you're being dramatic, but because a plane cabin genuinely puts real physiological strain on a body already working overtime.

Why flying is genuinely harder on this body

Commercial flight cabins are pressurised to simulate an altitude of roughly 1,500–2,500 metres — high enough that even a healthy person's blood oxygen typically dips from around 98% to 92%. For a nervous system already struggling with orthostatic regulation, that mild drop, combined with the low humidity of cabin air, can meaningfully add to symptom load. This isn't in your head, and it isn't just anxiety about flying — it's a documented physiological effect of the cabin environment itself.

Before you even reach the airport

• Scale back a few days ahead. Reducing physical and cognitive demands in the days before travel — sometimes described as "banking" energy — is a strategy several patient communities recommend to build a buffer before the trip even starts.

• Fill prescriptions early and pack an extra supply of every medication, in original containers, in your carry-on. Don't count on being able to refill anything at your destination.

• Consider a letter from your doctor outlining your condition, medications and any equipment you're travelling with — useful for airport security and, if needed, for care abroad.

At the airport and on the plane

• Request assistance without hesitation. Wheelchair assistance and accessibility programmes exist specifically to help conserve the limited energy you'll need for the rest of the trip.

• Hydrate seriously, not casually. Bring an empty bottle through security and fill it after. Many people with POTS use an electrolyte mix rather than plain water, since sodium — not just fluid — is what helps support blood volume; talk to your doctor about what ratio is right for you.

• Compression wear can help with the blood pooling that prolonged sitting makes worse — ask your doctor what level is appropriate for you.

• Move your legs regularly. Ankle pumps, seated marches, or standing when it's safe to do so all help counter blood pooling on a long flight.

• Pack sensory supports — earplugs, noise-cancelling headphones, an eye mask — since overstimulation itself can contribute to a flare.

For MCAS specifically

Recirculated cabin air and unfamiliar food are common concerns. Packing your own safe snacks rather than relying on airport or in-flight food, and keeping any prescribed emergency medication accessible in your carry-on rather than checked luggage, are both widely recommended by mast cell patient communities.

After you arrive — and after you're home

Build in downtime, not just sightseeing. Several experienced traveller-patients recommend planning low-activity days both during and immediately after a trip, since post-travel flares are common even when the trip itself went well. Choosing accommodation with easy food access — room service, a nearby kitchen — can also save energy that would otherwise go toward finding safe meals.

Frequently asked questions

Sources & further reading

The information in this article is drawn from the following sources, including patient-written travel guides. We encourage you to explore them, and to consult a travel medicine specialist before significant trips.

• Standing Up to POTS — Travel Tips

• The EDS Clinic — Can You Fly With POTS Syndrome? (cabin pressure and oxygen data)

• CDC Yellow Book — Travelers with Chronic Illnesses