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Low iron is most often simply due to low intake in the diet. Other than this, it may be low due to excessive iron loss, which can in turn be caused by blood loss e.g. due to menstruation.

Being "low on blood", i.e. a low total blood volume can have entirely different causes. On the one hand, this can also be due to excessive blood loss, though this would require a large wound. On the other hand however, defects in the kidney's water retention mechanisms can lead to excessive loss of water in the urine and thereby reduction of the blood volume (and consequently increase in blood concentration).

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11y ago

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