What causes secondary hyperparathyroidism?

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Secondary hyperparathyroidism usually caused by kidney failure, a problem where the kidney is unable to clean the blood of phosphorus produced by the body and unable to make enough vitamin D (specifically calcitriol, the active form of vitamin D). Other less common causes of secondary hyperparathyroidism are long-term lithium therapy, vitamin D deficiency, gastrointestinal malabsorption syndromes (when the intestines do not absorb vitamins and minerals properly), malnutrition, vitamin D-resistant rickets, or hypermagnesemia (abnormally high blood magnesium levels).  

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