If the body is still maintaing some form of "cycle" beneath the hormones, then even though the absolute value of the hormones is enough to keep the ovaries from ovulating... The other chemicals (lutenizing hormone, etc.) are waxing and waning. If you're sensitive to the lack of those... Or if there's actually a flux of estrogen and/or progesterone... Then you get the side effects. (Uteruses are especially prone to reacting to relative levels of hormones!)
Furthermore, the high level of estrogen and progesterone in most combined pills is meant to mimic "just after ovulation," and for some people, that's when PMS starts...
Other people only get "PMS" at the drop in hormones -- the placebo week -- and for them, some brands of pill actually have a little of the hormones in them to cushion the drop without actually being enough to prevent ovulation on their own.
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Date: 2010-03-27 01:01 pm (UTC)Furthermore, the high level of estrogen and progesterone in most combined pills is meant to mimic "just after ovulation," and for some people, that's when PMS starts...
Other people only get "PMS" at the drop in hormones -- the placebo week -- and for them, some brands of pill actually have a little of the hormones in them to cushion the drop without actually being enough to prevent ovulation on their own.