International Thyroid Awareness Week is May 25-31

ROCHESTER, Minnesota— Globally, women are roughly twice as likely as men to be diagnosed with thyroid cancer. However, recent research shows that men face an equal risk. Mayo Clinic experts say that men and women alike should be aware of thyroid cancer risk.

The thyroid is a small gland located at the front of your neck. It plays a role in regulating the body's metabolism. Thyroid cancer happens when cells in the thyroid develop changes in their DNA. 

Worldwide, thyroid cancer is the seventh most common cancer, statistics from the Global Cancer Observatory show.

Most forms of thyroid cancer can be cured, and minimally invasive surgery may be an option, sometimes sparing much of the noncancerous thyroid gland tissue, says Dr. Eric Moore, a head and neck surgeon and chair of otolaryngology at Mayo Clinic in Rochester, Minnesota, and medical director, Mayo Clinic International.

“Some thyroid cancer, though rarer, is very aggressive and more difficult to treat,” Dr. Moore adds. “While these were once thought untreatable, we have made great strides in treatment of the most aggressive of these cancers, and our research and treatment have made transformative strides in the outcomes for our patients with these types of thyroid cancer.”

It’s not known in most cases what caused the DNA changes that triggered thyroid cancer: Exposure to high levels of radiation, such as radiation therapy to the head and neck, may increase the risk, and some types of thyroid cancer may run in families.

In the past, it was believed that women developed thyroid cancer more than men. However, more recent data shows that women are often diagnosed with a less aggressive, relatively non-life-threatening form of thyroid cancer: When it comes to advanced thyroid cancer, the risks are the same for both men and women.

"Men have a risk, and we're not catching them as much," says Dr. Victor Bernet, an endocrinologist at Mayo Clinic in Jacksonville, Florida.

The reason is unclear. But one theory is that women are more proactive about their health and seeing their doctor regularly, leading to more diagnoses.

"So, in actuality, they probably don't have as much of a higher risk than we thought," explains Dr. Bernet.

Thyroid cancer might not cause any symptoms at first. But as it grows, it can cause signs and symptoms, such as swelling in your neck; changes to your voice, such as increased hoarseness; neck and throat pain; and difficulty swallowing.

Most people with thyroid cancer that requires treatment will have surgery to remove part or all of the thyroid. Which operation your health care team might recommend depends on your type of thyroid cancer, the size of the cancer and it has spread beyond the thyroid to the lymph nodes. Your care team also considers your preferences when creating a treatment plan.

Operations used to treat thyroid cancer include:

• Removing all or most of the thyroid (thyroidectomy). An operation to remove the thyroid gland might involve removing all of the thyroid tissue (total thyroidectomy) or most of the thyroid tissue (near-total thyroidectomy). The surgeon often leaves small rims of thyroid tissue around the parathyroid glands to reduce the risk of damage to the parathyroid glands, which help regulate the calcium levels in your blood.
• Removing a portion of the thyroid (thyroid lobectomy). During a thyroid lobectomy, the surgeon removes half of the thyroid. Lobectomy might be recommended if you have a slow-growing thyroid cancer in one part of the thyroid, no suspicious nodules in other areas of the thyroid and no signs of cancer in the lymph nodes.
• Removing lymph nodes in the neck (lymph node dissection). Thyroid cancer often spreads to nearby lymph nodes in the neck. An ultrasound examination of the neck before surgery may reveal signs that cancer cells have spread to the lymph nodes. If so, the surgeon may remove some of the lymph nodes in the neck for testing.

At Mayo Clinic, people with thyroid cancer are cared for by a team that includes a variety of specialties, such as endocrinologists; endocrine and head and neck surgeons; ear, nose and throat specialists; oncologists; radiologists; and pathologists. Team members have access to the latest technology, techniques and evidence, and weigh treatment options to create a personalized plan for each patient.

Among Mayo physicians dedicated to treating thyroid cancer, Mayo Clinic’s Advanced Thyroid Cancer Multidisciplinary Clinic focuses on advanced and aggressive thyroid cancers. Mayo researchers are studying the full range of the disease, from early stages to advanced cancers, to constantly refine the understanding and approach to all aspects of thyroid cancer and help physicians achieve the best outcomes for patients.

JOURNALISTS: Global, regional and national statistics on thyroid cancer are available here (free log-in may be required).

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About Mayo Clinic
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Media contact:

• Sharon Theimer, Mayo Clinic Communications, newsbureau@mayo.edu

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