Dysbaric illnesses refer to conditions that arise from the changes in pressure experienced by divers and other individuals traveling at high altitudes, such as mountain climbers. Synonyms for dysbaric illnesses include decompression sickness, barotrauma, and caisson disease. Decompression sickness is caused by the formation of nitrogen bubbles in the body's tissues due to rapid pressure changes. Barotrauma, on the other hand, results from the physical effects of pressure changes on the body's tissues, such as the lungs or ears. Caisson disease is a specific type of dysbaric illness that occurs in construction workers exposed to high levels of pressure while working in underwater tunnels or caissons.