Thyroid Nodules
Thyroid nodules are small lumps that form within the thyroid gland, located in the front of the neck. They are very common and are usually harmless, often discovered during a routine examination or scan. Most nodules don’t cause symptoms, but some can grow large enough to be felt or seen. While the majority are benign, a small number may require further assessment to rule out cancer or monitor for changes over time.
Overview | Symptoms & Causes | Diagnosis | Treatment Options
The Thyroid Gland
The thyroid gland is a small, butterfly-shaped gland that sits at the front of your neck. It produces hormones that regulate many essential functions, including metabolism, temperature control, heart rate, and energy levels. When the thyroid is working normally, you usually don’t notice it at all.
A thyroid nodule is a lump that develops within the thyroid tissue. Nodules are very common, especially with increasing age, and most are benign (non-cancerous). They can be solid, fluid-filled (cystic), or a mixture of both. Many thyroid nodules cause no symptoms and are found incidentally during an ultrasound or routine examination. However, some may affect thyroid hormone production or, rarely, have features that raise concern for cancer - which is why proper evaluation is important.
Understanding Thyroid Nodules
Thyroid nodules are extremely common. In fact, it’s estimated that around half of all people will develop at least one thyroid nodule in their lifetime, often without ever knowing it. Most nodules are benign (non-cancerous) and do not cause any symptoms. However, when symptoms do occur, they are usually related to the size, location, or effects on thyroid hormone levels.
Common symptoms may include:
- A noticeable lump in the neck: You might feel or see a small swelling at the front of the neck, especially when swallowing.
- A feeling of pressure or fullness: Larger nodules can press on nearby structures, causing a sense of tightness in the neck.
- Difficulty swallowing: This may happen if the nodule presses on the oesophagus.
- Hoarseness or voice changes: Uncommon, but can occur if the nodule affects the vocal cord nerves.
- Breathing discomfort: Large nodules or an enlarged thyroid (goitre) may cause shortness of breath, particularly when lying down.
Even though most thyroid nodules are harmless, it’s still important to have any new lump in the neck assessed by a healthcare professional. This helps confirm that the nodule is benign and ensures that nothing more serious is missed. You should also seek medical review if a known thyroid nodule changes in size, becomes painful, or begins causing symptoms such as difficulty swallowing, breathing problems, or voice changes.
Causes & Risk Factors
Thyroid nodules develop for a variety of reasons, and in many cases the exact cause is not known. Most are benign (non-cancerous) and form as part of normal changes in the thyroid gland over time. Factors that can increase the likelihood of developing a thyroid nodule include:
| Ageing | Nodules become more common as people get older. |
| Sex | Thyroid nodules are significantly more common in women than men. |
| Thyroid inflammation | Conditions such as Hashimoto’s thyroiditis can cause the thyroid to become lumpy or enlarged. |
| Family history | Having a close relative with thyroid nodules or thyroid disease increases risk. |
| Iodine deficiency | Uncommon in the UK, but low iodine intake can lead to thyroid enlargement and nodule formation. |
It’s important to note that most of these factors do not increase the risk of thyroid cancer, only the likelihood of developing a nodule. Most nodules remain harmless and stable over time.
Diagnosing Thyroid Nodules
If you notice a new lump in your neck or your clinician feels one during an examination, further assessment is usually recommended to understand what the nodule is and whether any treatment or monitoring is needed. Most nodules are harmless, and the purpose of diagnosis is to confirm this and rule out anything more serious.
Your clinician will begin by asking about your symptoms and medical history, and will examine your neck to assess the size, location, and feel of the nodule. They may also check for signs of thyroid overactivity or underactivity.
| Ultrasound | An ultrasound is the key test for thyroid nodules. It provides detailed images of the thyroid gland and helps determine: - Whether the lump is solid, cystic (fluid-filled), or mixed - The size, shape, and internal features of the nodule - Whether the appearance is reassuring or if further investigation is needed |
| Fine-needle Aspiration | If the ultrasound shows features that need closer assessment, a small needle biopsy may be recommended. This involves taking a tiny sample of cells from the nodule, guided by ultrasound, to determine whether it is benign. |
| Blood Tests | Thyroid function tests may be used to check how well the thyroid is working. These can help identify whether the nodule is affecting hormone levels, although many nodules occur with normal blood results. |
Next Steps
Most thyroid nodules do not require treatment. Management depends on the size of the nodule, your symptoms, and how it appears on ultrasound or biopsy. In many cases, monitoring is all that is needed.
| Observation | If the nodule looks completely benign and is not causing symptoms, the safest and most common approach is simple observation. Many people never need further intervention. |
| Treating underlying thyroid hormone problems | If the nodule is associated with an overactive or underactive thyroid, you may be offered medication to correct hormone levels. Treating these imbalances can relieve symptoms and prevent complications. |
| Radiofrequency ablation (RFA) | RFA uses a thin needle and gentle heat to shrink benign thyroid nodules without surgery. It is done under local anaesthetic, guided by ultrasound, and usually leaves no scar while preserving normal thyroid function. |
| Surgery | Surgery is only recommended in specific situations, such as a suspicious biopsy result, or if the nodule is causing significant symptoms. Surgery usually involves removing part or all of the thyroid gland and is generally considered only when necessary. |
How can Lanthorn help?
Thyroid Ultrasound - £300
We provide high-resolution ultrasound to assess the nodule’s size, appearance, and features. This helps determine whether it looks benign and whether any follow-up is needed.
Fine-needle Aspiration - £700
If further assessment is required, we can arrange an ultrasound-guided FNA to collect a small sample of cells from the nodule, often in the same appointment. This test helps confirm whether the nodule is benign.
Advanced Thyroid Function Blood Test - £99
We can also organise thyroid function tests to check how well your thyroid is working and see whether the nodule is affecting hormone levels.
