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A minor increase in hemoglobin helps the blood carry oxygen better. This is common and a normal accommodation in people that live at high altitude.

An excessive increase in hemoglobin causes the disease hemochromatosis, the typical treatment prescribed for hemochromatosis is frequent blood donations to reduce the level of hemoglobin. Untreated hemochromatosis can cause iron deposition in several organs (including the brain) resulting in damage to those organs and worsening of symptoms of various other illnesses that might be present.

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14y ago

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