Diving medicine specialists treat decompression sickness and arterial gas embolism. Diving medicine involves the diagnosis, treatment and prevention of conditions caused by diving. It includes the effects on the body of depth or pressure on gases in the body (e.g. decompression sickness and nitrogen narcosis); the diagnosis and treatment of conditions caused by marine hazards (e.g. injuries and infections); and diving health (e.g. assessing fitness to dive).