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Definition of hypovolemia in US English - a decreased volume of circulating blood in the body.
Hypovolemia - Causes. 1  Common causes of hypovolemia are [4] 2  Loss of blood (external or internal bleeding or blood donation [5]) 3  Loss of plasma (severe burns [6] [7] and lesions discharging fluid) 4  Loss of body sodium and consequent intravascular water; e.g. diarrhea or vomiting.