The dry air, low pressure, and the low amount of oxygen cause the immune system to weaken and can lead to inflamed sinus cavities.
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Your sinuses and ears can usually adjust quickly to the changing pressure so that you avoid pain or injury. However, when you are suffering from an underlying sinus issue, your sinuses may be slow to react, causing immense sinus pain while flying.
Answer From Sheldon G. Sheps, M.D. Leg and foot swelling during air travel is common and typically harmless. The most likely culprit is inactivity during a flight.
Elevate your feet. If you're uncomfortable, grab a seat at the arrival gate where you can elevate your feet. ...
Soak your feet or take a bath when you arrive at your accommodations. Just as a hot tub or jacuzzi increases blood flow, a hot bath can have the same effect. ...
Feeling unwell directly after a flight is often the cause of low humidity. Planes have a different atmospheric pressure than we are used to, which can cause the nasal passages to dry, leading to symptoms resembling flu.
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.
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.