How Do Thyroid Hormones Affect the Menstrual Cycle?
Thyroid hormones significantly influence the menstrual cycle. Both hypothyroidism and hyperthyroidism can lead to menstrual irregularities. Hypothyroidism often causes heavy menstrual bleeding (menorrhagia) or infrequent periods (oligomenorrhea), while hyperthyroidism can result in lighter and less frequent menstrual cycles.
