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In page Hereditary haemochromatosis:

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If excess iron in the heart interferes with its ability to circulate enough blood, a number of problems can occur, including (potentially fatal) congestive heart failure. The condition may be reversible when haemochromatosis is treated and excess iron stores are reduced. Arrhythmia or abnormal heart rhythm can cause heart palpitations, chest pain, and light-headedness, and is occasionally life-threatening. This condition can often be reversed with treatment.[citation needed]