5. Thyroid Disorder
Any kind of thyroid gland malfunction, whether it is an overactive thyroid (hyperthyroidism) or underactive thyroid (hypothyroidism), can cause menstrual irregularities.
The thyroid gland produces hormones that maintain the body’s metabolism and impacts many sex hormones. Changes in estrogen and cortisol hormones can halt ovulation, which in turn affects the menstrual cycle.
A 1999 study done in Mexico and published in Ginecología y obstetricia de México indicates that primary hyperthyroidism is one of the leading causes behind missed periods.
A recent 2016 study published in the Journal of Obstetrics and Gynecology of India reports that thyroid dysfunction is an important causative etiology of menstrual abnormalities. The study put emphasis on the assessment of thyroid function in women with menstrual disorders to avoid unnecessary interventions like curettage and hysterectomy.
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