Chronic bleeding can refer to anything from heavy menstrual bleeding to internal bleeding. Bleeding in the stomach, small intestine, and large bowel are especially prone to causing low hemoglobin levels. A lesser-known cause of chronic bleeding is excessive blood draws. This typically encompasses individuals receiving multiple blood draws for a medical reason but can also be due to blood donation. Chronic internal bleeding alone is dangerous, but the combination of that bleeding and low hemoglobin levels is even more serious.

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