Most commercial airplanes are pressurized to the equivalent of about 7,000–8,000 feet. United States Air Force researchers have shown that uninjured people have very little change in cognitive function or symptoms at this altitude, but that this is not the case after concussion. Symptoms and deficits that had resolved can come back at altitude, most notably headaches, slowing of cognitive performance, and impaired balance. Inform the patient and family about this risk and then let them make their own decisions about whether it is worth it. There is no evidence of permanent harm from flying or traveling to moderate altitude in concussion patients, but it has not been carefully studied.
Effects of Acclimatization on Cognitive Function at High Altitude
