Your thyroid is a small gland in the front of your neck, just below your Adam's apple

The thyroid is a butterfly-shaped gland about the size of a walnut that sits in the lower front of your neck. It wraps around your windpipe (the tube you breathe through) and sits just below the larynx, which is where your Adam's apple is. You can feel your own thyroid by placing your fingers on your neck just below your chin and swallowing — you may feel it move slightly as you swallow.

Even though it is small, your thyroid does important work. It makes hormones that control how fast your body uses energy, how warm you feel, and how quickly your heart beats. These hormones affect nearly every cell in your body, which is why thyroid problems can cause symptoms that seem unrelated to your neck.

Key Takeaways

  • Your thyroid is a small, butterfly-shaped gland located in the front of your neck, just below your Adam's apple.
  • The thyroid makes hormones that control your metabolism, body temperature, and heart rate.
  • You can sometimes feel your own thyroid by placing your fingers below your chin and swallowing.
  • Problems with the thyroid can affect energy, weight, mood, and body temperature because thyroid hormones reach almost every cell.

How the thyroid connects to other parts of your body

Your thyroid does not work alone. It takes orders from your pituitary gland, a pea-sized gland at the base of your brain. The pituitary sends a signal called TSH (thyroid-stimulating hormone) that tells your thyroid how much hormone to make. Your thyroid then releases two main hormones — T4 and T3 — into your bloodstream, where they travel throughout your body.

This back-and-forth communication is called the hypothalamic-pituitary-thyroid axis, or HPT axis. When your body has enough thyroid hormone, it sends a signal back to the pituitary to slow down. When levels drop, the pituitary sends more TSH to tell the thyroid to make more hormone. This system keeps your thyroid hormone levels in balance.

What happens when you have a thyroid problem

When your thyroid does not work correctly, it can make too much hormone (a condition called hyperthyroidism) or too little (called hypothyroidism). Because thyroid hormones affect so many body systems, problems with the thyroid can show up in unexpected ways.

If your thyroid makes too much hormone, you might feel jittery, lose weight without trying, sweat more than usual, or feel your heart racing. If your thyroid makes too little hormone, you might feel tired, gain weight, feel cold, or have trouble concentrating. A doctor can measure the amount of thyroid hormone in your blood with a simple blood test to learn about your thyroid is working correctly.

Why doctors examine the neck during a thyroid check

When a doctor suspects a thyroid problem, they often feel your neck to check the size and shape of your thyroid gland. This is called a thyroid palpation. The doctor will ask you to swallow while they gently press on the sides of your neck to feel whether the gland is enlarged, has lumps, or feels tender.

A normal thyroid is usually not noticeable when a doctor feels it — it is too small to see or feel easily. If the thyroid is enlarged (a condition called a goiter), the doctor can feel it and may order an ultrasound to get a clearer picture. An ultrasound uses sound waves to create an image of the thyroid and can show whether there are nodules (small lumps) or other changes.

The difference between thyroid size and thyroid function

It is important to understand that the size of your thyroid and how well it works are two different things. You can have a normal-sized thyroid that does not make enough hormone, or an enlarged thyroid that works fine. A blood test measures function (how much hormone your thyroid is making), while an ultrasound or physical exam shows size and structure.

This is why doctors usually order both a blood test and sometimes an imaging test when they are investigating thyroid problems. The blood test tells them whether the thyroid is making the right amount of hormone. The imaging test shows them the physical condition of the gland itself.

Common thyroid conditions and where they start

Many thyroid conditions begin in the gland itself. Hashimoto's disease and Graves' disease are autoimmune conditions where your immune system attacks the thyroid, either slowing it down or speeding it up. Thyroid nodules are small lumps that grow in the gland — most are harmless, but a doctor may want to monitor them or test them.

Sometimes thyroid problems start elsewhere. If the pituitary gland is not sending enough TSH, the thyroid will not make enough hormone even though the gland itself is healthy. This is why doctors test both TSH and thyroid hormone levels — the results together tell them where the problem is.

What to expect if your doctor wants to look more closely at your thyroid

If your doctor finds something unusual during a neck exam or if your blood tests show a thyroid problem, they may order an ultrasound. This is a painless test where a technician moves a small handheld device over your neck while you lie on your back. The device sends sound waves through your skin and creates a picture of your thyroid on a screen.

An ultrasound takes about 15 to 30 minutes and does not use radiation. If the ultrasound shows a nodule that needs closer inspection, your doctor might recommend a biopsy — a procedure where a thin needle is used to collect a tiny sample of cells from the nodule. This sample is then looked at under a microscope to check whether the cells are normal or abnormal.

Frequently Asked Questions

Can you see your thyroid from the outside?

Usually not. A normal thyroid is too small to see. If your thyroid is enlarged (a goiter), you may notice a swelling or bulge in the front of your neck, especially when you swallow or tilt your head back. If you notice any new swelling in your neck, tell your doctor.

Does everyone's thyroid feel the same when a doctor examines it?

No. Thyroid size varies from person to person. Some people have naturally larger thyroids than others, and this does not always mean there is a problem. Your doctor compares what they feel to what is normal for your body and looks for changes, lumps, or tenderness.

What does it mean if a doctor says my thyroid is "palpable"?

It means your doctor could feel your thyroid during the neck exam. This does not automatically mean something is wrong — it just means your thyroid is large enough to feel. Your doctor will order blood tests and possibly an ultrasound to determine whether it is functioning normally.

Can thyroid problems cause neck pain?

Some thyroid conditions can cause neck discomfort or tenderness, especially if the gland is inflamed. Thyroiditis (inflammation of the thyroid) can cause pain in the front of the neck or pain when swallowing. If you have neck pain along with other symptoms like fatigue or temperature sensitivity, mention it to your doctor.

Is the thyroid the same as the Adam's apple?

No, they are separate structures. The Adam's apple is part of your larynx (voice box) and is made of cartilage. Your thyroid sits just below it and wraps around your windpipe. You can feel both if you place your fingers on the front of your neck and swallow.