What Poses Risk to Your Cardiovascular Health
There are several reasons for the association between thyroid cancer and CV disease. Thyroid cancer can produce several physical effects, some of which directly contribute to the development of cardiovascular issues.
Several of the therapeutic methods used to treat thyroid cancer also contribute to the development of cardiovascular disease.
Levothyroxine Suppression
After surgical removal of the thyroid gland and, in some cases, after treatment with radioactive iodine, you may be given a prescription for a high dose of levothyroxine. This medication is a thyroid hormone replacement, and high doses (known as supraphysiologic doses) are used to suppress the thyroid-stimulating hormone (TSH) level. Keeping very low or undetectable TSH levels can prevent the recurrence of thyroid cancer.
However, the use of supraphysiologic doses of levothyroxine is also strongly associated with an increased risk of CV disease and atrial fibrillation.
Thyroidectomy
Removing thyroid cancer by completely resecting the thyroid gland is associated with a lower risk of cancer recurrence, but a slightly higher risk of cardiovascular disease, as recently shown by a retrospective analysis.
Radioactive Iodine
Used for treatment of thyroid cancer, radioactive iodine binds to and destroys cancerous thyroid tissue, as well as normal tissue in the thyroid gland. Treatment with radioactive iodine has been linked with a high occurrence of CV disease after thyroid cancer, though the reasons why are not clear.
Managing Your Cardiovascular Disease Risk When You Have Thyroid Cancer
If you have or have had thyroid cancer, it is important to understand that adequate cancer treatment does not mean that you no longer have to deal with some of the complications of cancer.
While it can be upsetting to know that your cancer effects have not truly disappeared after treatment of the tumor, CV disease risk factors can be effectively managed.
Be sure to maintain regular medical visits with your healthcare provider, as yearly physicals routinely include measurements of your blood pressure and assessments of your heart rhythm (which can help your healthcare provider detect atrial fibrillation). That said, don’t hesitate to make an earlier appointment if you are experiencing any symptoms you are concerned about.
If you have signs of heart disease or hypertension, your healthcare provider may prescribe medication to regulate your heart rhythm, optimize your blood pressure, or reduce your risk of developing a blood clot.
A Word From Verywell
If you have or have had thyroid cancer, you should know that there are several types of thyroid cancer, and the prognosis varies depending on which type you have. As you are dealing with treatment for your cancer, you also need to be attentive to how your cancer and your thyroid function can affect your health. With attention, effects of thyroid cancer and thyroid disease can be managed to reduce the impact of your condition on your overall health.
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