Smoking and Thyroid Disease
Exploration of the Connections
Let's take a look at the answers.
Studies show that smokers are more likely to have thyroid enlargement, and it is possible that mild thyroid
enlargement in smokers could be a sign of subtle thyroid disturbance.
There are specific relationships between thyroid disease and smoking that are also important to recognize.
The Longer and More You've Smoked, The More Risk of Thyroid Disease You FaceA March 2000 study reported on in the Archives of Internal Medicine found that smoking is associated with an increased risk of developing clinically overt thyroid disease.Their data also suggested that cumulative cigarette consumption is a risk factor, most pronounced in autoimmune thyroid disease.
Smoking Increases the Risk of Graves' DiseaseAccording to a Jan. 27, 1993 article in the Journal of the American Medical Association smokers are twice as likely as nonsmokers to develop Graves' disease. According to that research, smoking also apparently worsens eye problems in people with Graves' disease.
And the September 2000 issue of "Thyroid" reported on research suggesting that environmental factors such as smoking, rather than genetics, were likely to predispose certain individuals with autoimmune thyroid disease to severe Graves' disease.
Smoking Increases the Risk of Thyroid Eye DiseaseThe most dramatic effect of smoking on the thyroid is its association with Graves' hyperthyroidism, and especially with Graves' ophthalmopathy.
According to the Jan. 27, 1993 JAMA study, smoking also worsens eye problems in people with Graves' disease.
Researchers have also recently learned that smoking reduces the effectiveness of treatments for thyroid eye disease. The researchers reviewed the outcomes of 300 Graves' disease patients with mild eye symptoms treated with radioiodine alone or with steriods, and 150 with serious eye complications who received steroids and radiation therapy for their thyroid eye disease.
Among Graves' disease patients who had milder eye symptoms, smokers were more
likely to progress to more serious thyroid eye disease than nonsmokers. Radioidone
and steroid treatment for thyroid eye disease was also four times more effective in
dealing with the eye symptoms for nonsmokers than smokers. This same
relationship also applied to patients with more serious thyroid eye disease. ("Smoking affects
Graves' disease treatment," Annals of Internal Medicine, 1998;129:632-635.)
Smoking Increases the Risk and Severity of Hashimoto's DiseaseOne study also suggests that that smoking may increase the risk of hypothyroidism in patients with Hashimoto's thyroiditis. .
The Relationship Between Quitting Smoking and Thyroid Disease OnsetBack in 1996, I posted a request the Usenet newsgroup alt.support.thyroid for anecdotal information from other women who, like me, were diagnosed hypothyroid after stopping smoking. I stopped smoking in July of 1995, and it was not too long after that I was diagnosed as hypothyroid. So I began to wonder about the relationship between thyroid disease and smoking.
I received a large number of responses from women who said had the same experience -- diagnosed with hypothyroidism not long after stopping smoking.
And, for smokers with undiagnosed thyroid dysfunction, without proper thyroid hormone treatment, stopping seems to be a metabolic/weight gain double whammy, as they lose the appetite suppressant, metabolism-upping effects of nicotine, and experience the full effects of the hypothyroidism.
Why You Should Quit?If you have thyroid disease, you should quit smoking now!! Smoking can and often will worsen your existing thyroid problem, and if you have Graves' Disease or Thyroid Eye Disease, you absolutely must quit smoking to help prevent further progression of problems or worsening of your eye problems.
There are many effective ways to quit, and you can find out about them all at Christine Rowley's excellent Quit Smoking Website at About.com.
I've been there, too, so maybe I can help as well. Read the story of how I personally quit smoking in July of 1995, after smoking for 15 years.
All information is intended for your general knowledge only and is not a substitute for medical advice or treatment for specific medical conditions. You should seek prompt medical care for any specific health issues and consult your physician or health practitioner before starting a new treatment program. Please see our full disclaimer.