The days of the menstrual cycle counted from the first day of flow, called Day One, to the day before the next flow starts.
Explore All Resources
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Help for Anovulatory Androgen Excess (AAE)—Challenge PCOS!
Daily Progesterone therapyFertility -
Ovarian Hormone Therapy for Women with Early Menopause
Common Menstrual ConcernsCramps and painful periods -
Stopping Estrogen Treatment (Sometimes called “HRT”)
Daily Progesterone therapyEstrogen treatment -
Young Women and Osteoporosis — Good news about treatment and prevention
Breast tenderness & lumpsCommon Menstrual Concerns -
The Death of Hormone Replacement Therapy — Why and how to use Ovarian Hormone Therapy
Breast cancerDaily Progesterone therapy -
How Can I Tell I Am in Perimenopause?
Breast tenderness & lumpsCommon Menstrual Concerns -
Perimenopause – women’s misunderstood, confusing, and long midlife transition.
Breast cancerBreast tenderness & lumps -
Ovulatory Disturbances: They Do Matter
Basic Physiology / HormonesBreast tenderness & lumps
Glossary
Visit the Glossary to learn more about the specific terms used on this website.
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Cycle day
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Hormone Replacement Therapy
Abbreviated to HRT. An innaccurate term for estrogen or estrogen plus progesterone/progestin therapy for menopausal women. See OHT or Ovarian Hormone Therapy for a more appropriate term.
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