Chvostek sign
These facial spasms are caused by the nerves that control the muscle being easily excited (called hyperexcitability) due to hypocalcemia. Hypocalcemia can be caused by many things, including parathyroid conditions (such as when the parathyroid gland does not function well, called hypoparathyroidism) and vitamin diseases (such as a vitamin D deficiency). Sometimes, the Chvostek sign can be caused by other conditions which interfere with the balance of calcium, such as imbalanced acid and alkaline in blood causing respiratory alkalosis (an alkaline blood pH).
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