钙是人体的必需元素，在妊娠状态下，孕妇需钙量增加，如得不到充分的补充，则机体内钙平衡失调、血清钙浓度降低、细胞内钙浓度升高，致使细胞内钙负荷加大，从而导致血管平滑肌过度收缩，血管痉挛，血压升高等一系列妊高征病理过程的发生。研究表明，孕妇缺钙可能是引起妊娠高血压综合征的原因之一 Calcium is an essential element of the body, in pregnancy, pregnant women need calcium to increase, such as lack of adequate complementarity, the body’s calcium imbalance, decreased serum calcium concentration, intracellular calcium concentration, resulting in intracellular calcium load Increase, resulting in excessive contraction of vascular smooth muscle, vascular spasm, elevated blood pressure and a series of pregnancy-induced hypertension pathological process. Studies have shown that calcium deficiency in pregnant women may be one of the causes of pregnancy-induced hypertension syndrome