GPAtlas🧭 When to suspect (assessing a thyroid nodule)
A thyroid nodule is a discrete lesion within the thyroid gland, distinct from the surrounding parenchyma.
• Nodules are common – palpable in roughly 5% of women and 1% of men.
• Nodules are far more frequent on imaging, where they are an extremely common incidental finding.
• The clinically reassuring fact: the great majority are benign – only around 1 in 20 (~5%) prove malignant.
• The clinically important fact: this small minority cannot be excluded by clinical assessment alone, so every unexplained thyroid lump requires structured assessment to exclude cancer.
Patients may be entirely asymptomatic (the lump noticed by the patient, a clinician, or incidentally on a scan), or may present with:
• A neck mass
• Globus
• Dysphagia
• A persistent hoarse voice
A minority are functionally active, producing symptoms of hyper- or hypothyroidism.
The two primary-care tasks are simple and complementary:
• Measure the thyroid-stimulating hormone (TSH) to characterise thyroid function.
• Refer the unexplained lump down the correct pathway – while resisting the urge to request your own ultrasound, which fragments and delays the specialist diagnostic process.
| Background and patient factors raising suspicion |
|---|
| • Previous head and neck irradiation, especially in childhood (the strongest single risk factor) |
| • Family history of thyroid cancer or multiple endocrine neoplasia type 2 (MEN2) or familial syndromes (e.g. familial adenomatous polyposis [FAP], Cowden) |
| • Extremes of age – children/adolescents and older adults |
| • Male sex (nodules are less common in men but more likely to be malignant when present) |
| Nodule and examination features raising suspicion |
|---|
| • Hard, fixed or irregular nodule on palpation |
| • Rapid growth of the nodule |
| • Cervical lymphadenopathy accompanying the mass |
| • Persistent hoarseness or vocal cord palsy; compression (dysphagia, stridor) |
Source: NICE NG12 · NICE NG145 · British Thyroid Association and BAETS 2026
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