在妊娠早期(停经六周左右)，孕妇体内绒毛膜促性腺激素(HCG)增多，胃酸分泌减少及胃排空时间延长，导致头晕、乏力、食欲不振、喜酸食物或厌恶油腻、恶心、晨起呕吐等一系列反应，统称为早孕反应。这些症状一般不需特殊处理，妊娠12周后随着体内HCG水平的下降，症状多自然消...
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