What Is a Thyroid Nodule and How Is It Checked?

Most thyroid nodules announce themselves by accident. You feel perfectly well, you go in for a routine examination, and the clinician pauses at the base of your neck and says there's a small lump in the thyroid gland. The video above, just over four minutes long, explains what that lump actually is — and, just as importantly, why the great majority of them turn out not to be serious.

Step one: understand what the lump is

A thyroid nodule is simply a lump that forms within the thyroid, the small gland at the base of your neck, just above your breastbone. As the video explains, nodules can be solid or fluid-filled, and most don't cause symptoms at all — which is why so many are only discovered during a routine medical exam, or on a scan done for something else. Some do grow large enough to be visible, or to make swallowing or breathing feel difficult, and those symptoms are always worth reporting. One reassurance the video offers early is worth keeping in mind throughout: thyroid cancer accounts for only a small percentage of thyroid nodules. A nodule is a finding to check, not a diagnosis to fear — and it is a different situation from an underactive gland, the subject of our article on hypothyroidism.

Step two: examination and ultrasound

Checking usually starts with hands and questions. The clinician feels the neck, asks whether you've noticed a swelling, a change in your voice, or any trouble swallowing, and considers how the gland as a whole is working. After that, an ultrasound scan is the workhorse test: it uses sound waves to show the nodule's size, whether it is solid or fluid-filled, and what its edges look like. That picture helps the team judge which nodules can simply be watched and which deserve a closer look. Nothing about this step is painful, and it gives far more information than touch alone.

Step three: a needle sample, if one is needed

If the ultrasound picture or the nodule's size raises a question that only tissue can answer, the next step may be a fine needle biopsy. A very thin needle, guided by ultrasound so it lands in the right spot, takes a small sample of cells for examination under a microscope. You can see exactly how that looks in this site's companion video, "Fine Needle Biopsy of Thyroid Nodule", a short clip of about a minute and a half showing a fine needle biopsy performed with guided ultrasound. Not every nodule needs this step — it is reserved for the ones where the answer would change what happens next.

Step four: watch, or treat, based on the answer

From there, the path depends on what the checks showed. Many nodules need nothing more than periodic re-examination or a repeat scan to confirm they aren't changing. Others — particularly larger ones, or ones causing symptoms — may lead to a discussion about further treatment with the specialist team. Either way, the sequence is the point: find it, picture it, sample it only if needed, then decide. If you've just been told you have a nodule, you're most likely at step one of a calm, well-rehearsed process.

Frequently Asked Questions

Are most thyroid nodules cancerous?
No. The anchor video is clear that the great majority of thyroid nodules aren't serious and don't cause symptoms, and that thyroid cancer accounts for only a small percentage of them. Checking is how the small minority that need attention are identified.

How are thyroid nodules usually found?
Often by chance. As the video notes, you often won't know you have one until a doctor discovers it during a routine medical exam. Some larger nodules become visible, or make it difficult to swallow or breathe.

Does every thyroid nodule need a biopsy?
No. A biopsy is a step used when the examination and ultrasound leave a question that a cell sample can answer. The companion video shows a fine needle biopsy guided by ultrasound, so the needle reaches the nodule accurately.

Where exactly is the thyroid gland?
At the base of your neck, just above your breastbone, as the anchor video describes it. That is why a clinician checking a nodule examines the front of the lower neck.

MedicalVideos.com has published trusted medical videos since 2007. The site was founded by Dr. Mohamed Ibrahim, MD, PhD — physician-scientist.

Educational only — this article is general information about thyroid nodules, not medical advice and not a diagnosis. A lump in the neck should be assessed by a clinician, especially if it is growing or affects swallowing or breathing.