Divers using compressed air, caisson (tunnel) workers, and high-altitude pilots can all present with decompression sickness (DCS). In divers, this usually results from exceeding the dive table limits for depth and time. DCS can occur within minutes to hours of surfacing, rarely days later. Excessive bubble formation in tissue or circulation from saturated gas can cause both acute occlusive and delayed inflammatory effects. Type I DCS includes mottled skin and deep pain of the joints, usually the shoulder or knee, and is unaffected by movement. Type II, “serious,” DCS involves the central nervous system, typically the spine. Patients may initially complain of truncal constriction with ascending paralysis. Prolonged exposure at depth can lead to cardiopulmonary “chokes” or vestibular “staggers.” Because DCS and CAGE can be difficult to distinguish, or present simultaneously, the term “decompression illness” is now typically used.