Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started
My Medicine

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Women's Health

Font Size

Chemical May Be Linked to Thyroid Disease

Study Raises Questions About Non-Stick Chemical Known as PFOA

DuPont: PFOA Emissions Reduced continued...

A spokeswoman for DuPont tells WebMD the company has reduced PFOA emissions at its manufacturing sites worldwide by about 98% since that time, exceeding the interim target of 95% emission reduction by this year.

In response to the latest study, Janet Smith of DuPont points to research in communities with high PFOA exposures that show little or no impact on the thyroid.

“As the authors of the study indicated, it is not clear whether the associations they observed are causal,” she says. “Epidemiological studies involving workers who have had much higher levels of PFOA exposure than the general public haven’t shown any changes that would indicate impact on the thyroid.”

Thyroid Disease Link

Thyroid disease is much more common in women than in men. But the researchers found no evidence of a statistically different effect of PFOA exposure in women and men.

They did find a link between thyroid disease and higher concentrations of PFOS in men, but not in women.

Previous studies examining people living in communities where PFOA and PFOS are manufactured have shown little association between exposure to the chemical and thyroid hormone functioning.

But findings from the largest-ever study of PFOA exposure have not yet been made public.

In the ongoing C8 Study, researchers measured PFOA levels and health outcomes among nearly 70,000 residents of West Virginia who drank water contaminated with PFOA.

The study is funded by a $107 million lawsuit settlement agreed to by DuPont in 1998.

Preliminary findings suggest high PFOA levels may be linked to high blood pressure, high cholesterol, and impaired liver function.

University of Massachusetts thyroid researcher Thomas Zoeller, PhD, tells WebMD that thyroid disease is increasing, but the reasons for this remain unknown.

“There is almost certainly an environmental component to this, but we don’t know what that environmental component is,” he says.

He says PFOA and PFOS may be environmental triggers, but this remains to be proven.

And because it is not clear how people become exposed, there is no easy message for reducing exposure to these chemical compounds, he says.

“Right now, I don’t think we have the ability to know what kind of exposures we are getting and where it is coming from,” he says.

1 | 2

Today on WebMD

hands on abdomen
Test your knowledge.
womans hand on abdomen
Are you ready for baby?
birth control pills
Learn about your options.
Is it menopause or something else?
woman in bathtub
bp app on smartwatch and phone
estrogen gene

Send yourself a link to download the app.

Loading ...

Please wait...

This feature is temporarily unavailable. Please try again later.


Now check your email account on your mobile phone to download your new app.

Blood pressure check
hot water bottle on stomach
Attractive young woman standing in front of mirror