Breast cancer is the most commonly diagnosed cancer among women in the United States, and thyroid disorders affect millions of American women. Many breast cancers are sensitive to hormones like estrogen, and according to researchers, thyroid hormone has estrogen-like effects at high levels. So, for years, scientists have wondered whether having too much thyroid hormone might promote the development of breast cancer. A new study suggests the answer could be “yes.”
It’s all about the thyroid
The thyroid is a butterfly-shaped gland at the base of the neck that produces thyroid hormone. Thyroid hormone affects almost every cell in the body and has many crucial functions, like controlling metabolism, heart rate, and body temperature.
Some people have hyperthyroidism, or an overactive thyroid, in which the thyroid gland produces too much thyroid hormone. This can cause weight loss, thinning hair, sweating, anxiety, and a rapid heartbeat. Women are five to 10 times more likely than men to develop an overactive thyroid.
Hypothyroidism, or an underactive thyroid develops when the thyroid gland does not produce enough thyroid hormone. Symptoms of an underactive thyroid include weight gain, fatigue, constipation, depression, dry hair, and a slow heart rate. Like hyperthyroidism, it’s also more common in women than in men.
In an effort to determine whether having an overactive or underactive thyroid affects a woman’s risk of breast cancer, researchers looked at a large group of women in Denmark diagnosed with thyroid disease between 1978 and 2013. More than 60,000 of the study participants had an underactive thyroid, and more than 80,000 had an overactive thyroid. They followed the patients for five to seven years and found that those with an overactive thyroid had a slightly increased risk of breast cancer — an 11% higher risk, to be specific. However, women with an underactive thyroid had a 6% drop in their breast cancer risk.
Putting the study results into perspective
While this study might lead some to conclude that having excess thyroid hormone promotes the development of breast cancer, experts caution that this study does not prove cause and effect. While there may be an association, it is not clear that an overactive thyroid actually causes breast cancer to develop.
Some critics wonder whether women at risk for hyperthyroidism may also be at risk for breast cancer, or whether the treatment for hyperthyroidism may be to blame for increased cancer risk. Another theory is that women with an overactive thyroid see their doctors more often and therefore are more likely to get screened for other problems like breast cancer.
The effect of thyroid hormone on breast cancer risk clearly requires further study. In the meantime, women with an overactive thyroid should stay in close communication with their doctors and follow routine breast cancer screening recommendations.
Bible verses for today’s meditation and inspiration: Matthew E. McLaren
Matthew 15:7-9 “You hypocrites, rightly did Isaiah prophesy of you: ‘THIS PEOPLE HONORS ME WITH THEIR LIPS, BUT THEIR HEART IS FAR AWAY FROM ME. ‘BUT IN VAIN DO THEY WORSHIP ME, TEACHING AS DOCTRINES THE PRECEPTS OF MEN.'”
Mark 7:6-7 And He said to them, “Rightly did Isaiah prophesy of you hypocrites, as it is written: ‘THIS PEOPLE HONORS ME WITH THEIR LIPS, BUT THEIR HEART IS FAR AWAY FROM ME. ‘BUT IN VAIN DO THEY WORSHIP ME, TEACHING AS DOCTRINES THE PRECEPTS OF MEN.’
Isaiah 29:13 Then the Lord said, “Because this people draw near with their words And honor Me with their lip service, But they remove their hearts far from Me, And their reverence for Me consists of tradition learned by rote,
Luke 18:9-14 And He also told this parable to some people who trusted in themselves that they were righteous, and viewed others with contempt: “Two men went up into the temple to pray, one a Pharisee and the other a tax collector. “The Pharisee stood and was praying this to himself: ‘God, I thank You that I am not like other people: swindlers, unjust, adulterers, or even like this tax collector. read more.
John 4:24 “God is spirit, and those who worship Him must worship in spirit and truth.”
Exodus 15:11 “Who is like You among the gods, O LORD? Who is like You, majestic in holiness, Awesome in praises, working wonders?
Psalm 77:13 Your way, O God, is holy; What god is great like our God?
Psalm 99:5 Exalt the LORD our God And worship at His footstool; Holy is He.
Psalm 19:1-6 The heavens are telling of the glory of God; And their expanse is declaring the work of His hands. Day to day pours forth speech, And night to night reveals knowledge. There is no speech, nor are there words; Their voice is not heard.
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