decompression sickness

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A disorder, seen especially in deep-sea divers, caused by the formation of nitrogen bubbles in the blood and tissues following a sudden drop in the surrounding pressure, as when ascending rapidly from a dive, and characterized by severe pains in the joints and chest, skin irritation, cramps, and paralysis.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun pathology A sometimes fatal condition resulting from the formation of nitrogen bubbles in the blood and tissues, because of too rapid decompression, seen especially in deep-sea divers ascending rapidly from a dive. It is characterized by severe pains in the joints and chest, skin irritation, cramps, nausea, and paralysis.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun pain resulting from rapid change in pressure