Estrogen, Progesterone, and You

Estrogen and progesterone are the two hormones most central to the menstrual cycle and the menopause transition. Understanding their roles helps make sense of symptoms and treatment decisions.

Estrogen is produced mainly by the ovaries and affects far more than reproduction. It influences bone density, cardiovascular health, skin, brain function, mood, and the genitourinary system. During perimenopause, estrogen levels fluctuate widely; after menopause, they settle at a low, steady level.

The wide range of estrogen's effects explains why its decline can touch so many parts of the body — from hot flashes to sleep, mood, and bone health.

Progesterone is produced after ovulation and helps balance estrogen's effects, particularly on the lining of the uterus. As ovulation becomes less consistent in perimenopause, progesterone often falls before estrogen does — which can lead to heavier or irregular periods, sleep changes, and mood symptoms.

When estrogen is given as therapy to a person who still has a uterus, progesterone (or a progestogen) is typically prescribed alongside it to protect the uterine lining.

Hormone therapy is not about "more is better." It is about restoring a functional balance appropriate to your stage of life, at the lowest effective dose, for the right duration. That balance is individual — which is why it is calibrated in conversation, not assumed.