Curious whether there is a relationship between thyroid function and covid 19 infection? Recent research suggests that the inflammation caused by the sars coronavirus may have an impact on the thyroid by inducing inflammation, resulting in hypo or hyperthyroidism or even autoimmune thyroiditis.
As we've seen, coronavirus infection has a different effect on individuals with symptoms ranging from quite mild to very severe.
We've seen that COVID-19 infection can cause what's known as a cytokine storm, which is a hypersensitive immune reaction causing widespread inflammation through the body.
This hypersensitive immune reaction can in turn cause the immune system to wreak havoc on the thyroid, causing antibodies to attack the thyroid gland.
What is autoimmune thyroiditis?
Autoimmune thyroiditis occurs when your immune system attacks your thyroid cells. Your body begins to create antibodies that attack your thyroid gland. The types of autoimmune thyroid conditions include:
While there isn't one cause of autoimmune thyroid conditions are unknown, there are several causative factors including:
Genetics- Thyroid disease can be hereditary, so if a family member has a thyroid condition, you should be sure to get your thyroid checked
Infections- As mentioned above, the certain infections may cause a cytokine storm, which in turn may cause the body to produce antibodies attacking the thyroid
Sex- Research suggests that females are about 7x more likely to be affected by autoimmune thyroid disease.
Pregnancy- It is not uncommon for women to be diagnosed with a thyroid condition during the first year after having a baby, with 20% of these women developing Hashimoto's years later.Â
Personal history of autoimmune disease- If you have one autoimmune condition, you may be at risk for other autoimmune conditions. While the exact reason for this isn't quite known, its suspected that the defect that occurred causing the immune system to attack the body and create an autoimmune disease could cause another autoimmune disease
Excessive iodine intake- While iodine is a necessary mineral, when taken in excess via food or the skin,it can wreak havoc on your thyroid gland. If you're curious about some common sources of iodine, check out our blog post on hypothyroidism and its relationship with iodine.
COVID and Thyroid Disease- what does the research show:
There have been several studies looking at why we're seeing that the thyroid specifically is being so affected in those who had a recent SARS-Cov-2 infection.
As we know, SARS-CoV-2 infects human tissues by entering cells through the ACE2 or angiotensin-converting enzyme 2 receptor.
While we may associate the ACE2 receptor with our lungs, it is actually expressed in several other organs including the adrenal glands, thyroid gland, pancreas, testes, and ovaries.
For this reason, these other organs may be a target of the ACE2 receptor as well, which could cause an aggravation of already existing endocrine abnormalities or cause new ones.
It should also be noted that because of this connection, individuals with endocrine diseases may have a more severe response to a covid-19 infection.
More specifically, the angiotensin-converting enzyme 2 receptors were shown to have a positive association with the thyroid hormones, thyroxine (T4), and triiodothyronine (T3).
A recent study, compared 93 patients who were admitted to the ICU for a COVID-19 infection with 101 patients also admitted to the ICU for reasons other than COVID-19.
The study looked at thyroid function tests in both groups and excluded patients who already had a pre-existing thyroid disease. The study suggested that there was no statistical significance that would suggest thyroid disease predisposed individuals to infection with COVID-19.
In this medical review, thyroid markers including TSH, Free T4, and Free T3 were measured. Interleukin-6, an inflammation marker, was also measured to assess the inflammatory response in patients.
After assessing 287 patients, the study concluded that there was a relationship between thyroid conditions, hyperthyroidism specifically, and COVID-19.
Interestingly, the inflammatory marker, cytokine IL6 was increased in patients whose TSH values were suppressed, indicating a hyperthyroid state.
While there have not been enough studies looking at the relationship between thyroid and COVID-19, the current research is showing that COVID-19 could be causing an overactive immune system that could be responsible for hyperthyroidism.
So what do you do?
As we know, COVID-19 infection can have an effect on multiple organ systems. It is prudent to follow up with your physician so that they can order any indicated labs or imaging.
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