Deep vein thrombosis (DVT) is a condition in which a blood clot (thrombus) forms in one or more of the deep veins, usually in the legs. Blood clots can break free and travel with blood causing life-threatening condition like pulmonary embolism (PE) or a stroke due to paradoxical embolism in people with patent foramen ovale (PFO). DVT is not related to diving, but divers often travel and thus are exposed to risk of DVT. In case of acute DVT, divers must not dive.

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