Possibly serious-: You should discuss this with a physician in your area. You may have a pocket of trapped air/gas in your head that expands when going to altitude. This is usually from a sinus infection,trauma or developmental anomaly. Aircraft cabins are pressurized to simulate 8,000 ft (2400m) Like being up on a mountain. You may need a CT or MRI of the skull/brain. You may want to avoid flying for a bit.
Answered 2/1/2016
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