3 Reasons You'd Need a Thyroid Ultrasound

The thyroid is a small gland in the front of the neck that plays a big role in regulating metabolism, energy levels, and body temperature. When thyroid issues arise, your doctor may recommend a thyroid ultrasound to help identify the cause and guide treatment.

A thyroid ultrasound is a non-invasive imaging test that uses sound waves to create a picture of your thyroid gland. It’s quick, painless, and a valuable tool for diagnosing a range of thyroid-related conditions.

What Happens During a Thyroid Ultrasound?

During the procedure, you’ll lie on your back with your neck extended. A gel will be applied to your skin, and a small device called a transducer will be moved over your neck to capture real-time images of your thyroid. The test typically takes 20–30 minutes, and results are reviewed by your provider shortly after.

Top 3 Reasons for a Thyroid Ultrasound

1. Thyroid Nodules (Lumps on the Thyroid)

One of the most common reasons for a thyroid ultrasound is the detection of thyroid nodules—small growths on the thyroid gland. Most nodules are noncancerous and cause no symptoms, but some can produce excess thyroid hormone or affect swallowing and breathing.

An ultrasound helps determine:

• The size and number of nodules
• Whether the nodules are solid or fluid-filled
• If further testing, like a biopsy, is needed

If you notice a lump at the base of your neck or experience unusual symptoms, your provider may recommend an ultrasound to rule out serious conditions.

2. Enlarged Thyroid (Goiter)

A goiter is an overall swelling of the thyroid gland, often visible as a bulge in the neck. It can occur with both underactive (hypothyroidism) and overactive (hyperthyroidism) thyroid conditions.

Common symptoms include:

• Visible swelling in the neck
• Hoarseness or difficulty swallowing
• Fatigue, anxiety, or changes in weight

A thyroid ultrasound can assess the size and texture of the gland, helping providers determine the cause and best treatment approach.

3. Screening for Thyroid Cancer

While thyroid cancer is relatively rare, it affects over 40,000 people in the U.S. each year—especially women. Most thyroid cancers are treatable when caught early, which is why ultrasound plays a critical role in detection.

You may need a thyroid ultrasound for cancer screening if:

• You have a family history of thyroid cancer
• Your provider notices a suspicious lump
• You’ve had radiation exposure to the neck

Ultrasound helps identify whether a nodule appears suspicious, and it can guide fine-needle aspiration (FNA) if a biopsy is needed.

When Should You Talk to a Doctor?

If you’re experiencing symptoms like neck swelling, unexplained weight changes, difficulty swallowing, or fatigue, talk to your primary care provider (PCP) or endocrinologist. If your provider recommends a thyroid ultrasound, the BASS Imaging Center in Walnut Creek offers fast, accurate diagnostic imaging in a convenient and professional setting. Our team works closely with your doctor to ensure timely results and coordinated care.

‍Visit our Imaging Center: Learn more about BASS Imaging services or ask your provider to refer you today.