Minamata disease altitude sickness anoxemia anoxia anoxic anoxia anthrax asteroids aurora particles black lung blackout caisson disease chilblain cosmic particles cosmic ray bombardment decompression sickness frostbite immersion foot intergalactic matter itai jet lag lead poisoning mercury poisoning meteor dust impacts meteors motion sickness pneumoconiosis radiation radiation sickness radionecrosis red-out space bullets sunstroke the bends trench foot weightlessness