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The commonest cause of secondary amenorrhoea resulting from pituitary problems is hyperprolactinaemia (elevated prolactin levels - normal range up to 500IU/l)). Prolactin is the hormone that promotes milk production (lactation) following childbirth. Hyperprolactinaemia is the state of higher than normal blood levels of this hormone. The main causes of hyperprolactinaemia are:-
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