大多数绝经前的女性在月经之后的21天里，体内的雌激素会产生一种健康幸福感。

For the first 21 days after menstruation, estrogen hormones create a feeling of well-being and give generally happy feelings.

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激素周期变化。经前综合症的体征和症状随着激素的变化而发生变化，而在妊娠期和更年期的时候会消失。

Cyclic changes in hormones. Signs and symptoms of premenstrual syndrome change with hormonal fluctuations and disappear with pregnancy and menopause.

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在她们怀孕前的几个月内，测试了包括皮质醇在内的应激激素水平。

Levels of stress hormones including cortisol were measured in the months before pregnancy.

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