Progesterone is the dominant hormone before your menstrual period. There are progesterone receptors throughout the body so this hormone can affect many different body systems. One thing it does is slow the constriction of blood vessels when you change position. A slowing of constriction can cause a temporary decrease in blood flow to the brain when you stand up or turn quickly and this can result in dizziness. Stay well hydrated and move a tiny bit slower during this time if this is a problem for you.
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