<unk> , or<unk>  related medical conditions, are conditions associated with underwater<unk> , and include both conditions unique to underwater<unk> , and those that also occur during other activities. This second group further divides into conditions caused by exposure to ambient pressures significantly different from surface atmospheric pressure, and a range of conditions caused by general environment and equipment associated with<unk>  activities.<unk>  particularly associated with<unk>  include those caused by variations in ambient pressure, such as barotraumas of descent and ascent, decompression sickness and those caused by exposure to elevated ambient pressure, such as some types of gas toxicity. There are also non-dysbaric<unk>  associated with<unk> , which include the effects of the aquatic environment, such as drowning, which also are common to other water users, and<unk>  caused by the equipment or associated factors, such as carbon dioxide and carbon monoxide poisoning. General environmental conditions can lead to another group of<unk> , which include hypothermia and motion sickness, injuries by marine and aquatic organisms, contaminated waters, man-made hazards, and ergonomic problems with equipment. Finally there are pre-existing medical and psychological conditions which increase the risk of being affected by a<unk>  which may be aggravated by adverse side effects of medications and other drug use. Treatment depends on the specific<unk>  but often includes oxygen therapy, which is standard first aid for most<unk>  accidents, and is hardly ever contra-indicated for a person medically fit to dive, and hyperbaric therapy is the definitive treatment for decompression sickness. Screening for medical fitness to dive can reduce some of the risk for some of the<unk> .
Diving disorders
Jurosomatic illness
Depression 
Mood disorder
Personality pathology
Thought disorder
Psychosexual disorder
Psychoorganic syndrome