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

author image Helen Williams
Based in New York City, Helen Williams has been a feature writer for more than 15 years. She has written scientific posters, journal articles and book chapters for physicians, lawyers and the general public. Williams' narratives have appeared in publications including "Playgirl" and "Guideposts." She received a Bachelor of Arts in English from Tufts University.
What Are the Causes of One Side of a Thyroid Becoming Enlarged?
Most enlargements of the thyroid are benign.

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 Enlargement on just one side, however, is usually suggestive of a few conditions, including a nodule or cancer.

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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 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 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

Thyroid Cancer

Thyroid cancer, which is rare, usually appears as a separate lump within the thryoid gland, reports Unlike other causes of thyroid swelling, it typically appears as an enlargement on just one side of the thyroid, reports 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.

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