Thyroid issues often impact the menstrual cycle of premenopausal women. Physicians typically monitor menstrual activity to confirm suspicions of a thyroid-related diagnosis. Women with hypothyroidism often experience irregular menstrual periods. Bleeding during a period may be heavy or last longer than usual. In other cases, menstrual flow may be light and periods may become more or less frequent. Hyperthyroidism may cause a reduced flow that does not last as long as before, and periods may become irregular. However, changes in menstruation may not occur in all women with thyroid issues, and other medical conditions besides thyroid dysfunction can lead to menstrual changes.
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