Here's what I found for you. They also said the mechanism isn't really known. Also is this a question you came across or is this for school? IMO its not that high-yield of a question - maybe if you were talking thyroid levels...
Parathyroid hormone functions to maintain Ca++ levels in the blood. PTH is stimulated by low Ca++ levels in the blood and leads to Vitamin D activation, increased Ca++ absorption in the gut, increased bone reabsorption, increased Ca++ reabsorption in the kidney and increased PO4- excretion in the urine. The net result of PTH activity is an increase in blood Ca++ levels without an increase in PO4-. Hypertension could be caused by an increase in total peripheral resistance or an increase in blood volume. PTH can cause hypertension by increasing either of these two factors.
According to Goljan, the mechanism for hypertension due to hyperparathyroidism is that an increase in serum CA ion levels leads to an increase in smooth muscle contraction in arterioles.
According to Goljan, the mechanism for hypertension due to hyperparathyroidism is that an increase in serum CA ion levels leads to an increase in smooth muscle contraction in arterioles.
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