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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Beyond “Estrogen Deficiency”—news from Women’s Health Initiative
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The ABCs of Osteoporosis Prevention for Women in Midlife
Osteoporosis and bone health -
Estrogen Deficiency: The Wrong Idea About Menopause
Breast cancerDaily Progesterone therapy -
Perimenopause is a time of “Endogenous Ovarian Hyperstimulation”
Breast tenderness & lumpsCommon Menstrual Concerns -
Documenting Ovulation with Quantitative Basal Temperature (QBT)
Breast cancerCommon Menstrual Concerns
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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Beta-blocker
A kind of medicine used for high blood pressure, hyperthyroidism, heart disease, fast heart rates, migraine prophylaxis, and performance anxiety that prevents the action of catecholamines like adrenalin and noradrenalin. People with asthma should not take beta-blocker medicines. Propranolol is a kind of beta-blocker.
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