What Are the Causes of One Side of a Thyroid Becoming Enlarged?

The thyroid is a butterfly shaped gland located just under the skin at the base of the neck that regulates the body's energy rate, including heart pulse and blood pressure. The thyroid can become enlarged for many reasons, including production of too much or too little thyroid hormone, reports MayoClinic.com. Enlargement on just one side, however, is usually suggestive of a few conditions, including a nodule or cancer.

Thyroid Cyst

A thyroid cyst is filled with fluid and ranges in size from less than one third of an inch to over an inch, according to MayoClinic.com. Most are benign, although complex cysts, which have solid parts too, are more likely to be cancerous.

Solitary Colloid Nodule

A single colloid nodule, which is overgrowth of normal tissue, can appear on one side of the neck, reports MayoClinic.com. Colloid nodules are benign and do not spread outside of the thyroid gland.

Inflammatory Nodule

Rarely, an inflammatory nodule may develop on one side of the neck. It can be caused by chronic swelling of the thyroid gland or be set off by pregnancy, which is called postpartum thyroiditis, reports MayoClinic.com.

Thyroid Cancer

Thyroid cancer, which is rare, usually appears as a separate lump within the thryoid gland, reports EndocrineWeb.com. Unlike other causes of thyroid swelling, it typically appears as an enlargement on just one side of the thyroid, reports MayoClinic.com. The lump is hard and may grow quickly. It can cause hoarseness and difficult swallowing. The lymph nodes near the neck or jaw may be swollen too.

Load comments

Copyright © 2019 Leaf Group Ltd. Use of this web site constitutes acceptance of the LIVESTRONG.COM Terms of Use , Privacy Policy and Copyright Policy . The material appearing on LIVESTRONG.COM is for educational use only. It should not be used as a substitute for professional medical advice, diagnosis or treatment. LIVESTRONG is a registered trademark of the LIVESTRONG Foundation. The LIVESTRONG Foundation and LIVESTRONG.COM do not endorse any of the products or services that are advertised on the web site. Moreover, we do not select every advertiser or advertisement that appears on the web site-many of the advertisements are served by third party advertising companies.