Right : Right before a period your levels of Progesterone typically drop (unless you are pregnant). Progesterone causes some of the premenstrual symptoms like bloating in the second half of the cycle. If a pregnancy does not "rescue" the corpus luteum and allow it to continue making Progesterone the corpus luteum will involute and stop making progesterone. This will then trigger "progesterone withdrawal bleeding" and the endometrium or lining of your uterus will shed noticed as menstrual bleeding. You are likely not lacking anything but experiencing the effects of relief of the sedation associated with progesterone.
Answered 6/4/2017
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Relative difference!: Women's hormones are the lowest during there menses. The loss of progesterone is what causes the menses (period). I believe what is happening is the 12-14 days before your menses your progesterone hormone is present which causes tiredness, constipation, bloating (premenstrual symptoms). The day before your period it is low. You may just be noticing the difference when the progesterone goes away.
Answered 10/23/2017
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