The Bends (Decompression sickness)

• Can happen over 18k ft, especially with repeated ascent
• Is a substantial risk over 30k ft
• Is a much greater risk after diving
• Risk is related to altitude and rate of ascent
• In gliders, is a risk in wave flights
• In pressurized aircraft, is likely in depressurization accidents.
• Can result in permanent injury.
  • If you think it's happened, seek a bariatric physician.

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