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A link has been found between overactive thyroid and breast cancer whereby women who have hyperthyroidism have been found to have an increased risk of breast cancer. According to researchers, the risk is 11 percent higher, compared to women with normal functioning thyroids.
Although hyperthyroidism was associated with an increased risk of breast cancer, hypothyroidism – an underactive thyroid – was found to decrease the risk of breast cancer by six percent.
The findings come from a 36-year review that identified nearly 80,000 Danish women with hyperthyroidism and over 61,000 women with hypothyroidism. All the women were cancer free at the beginning of the study.