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At a glance
- A thyroid nodule is a lump within the thyroid gland at the front of the neck.
- They are very common and the large majority are benign (non-cancerous).
- Most cause no symptoms and are found by chance or as a neck lump.
- Assessment with ultrasound and sometimes a needle biopsy determines if any treatment is needed.
What it is
The thyroid is a small, butterfly-shaped gland at the front of the neck, just below the Adam’s apple, that makes hormones controlling the body’s metabolism. A thyroid nodule is a discrete lump that forms within this gland. Nodules can be solid, fluid-filled (a cyst), or a mixture of both, and a person may have a single nodule or several. They are extremely common, becoming more frequent with age, and many are so small that they are discovered only when the neck is scanned for another reason. The great majority are harmless overgrowths of thyroid tissue that pose no threat to health. The reason nodules are assessed at all is to identify the small minority that could be cancer or that are affecting how the gland works, so the many benign, quiet nodules can be reassured and simply watched.
Symptoms
Most thyroid nodules cause no symptoms and are noticed as a painless lump in the neck, or found incidentally on an imaging scan. A larger nodule may be visible or felt, and can occasionally press on nearby structures, causing a sensation of tightness or fullness, mild difficulty swallowing, or, less often, a change in the voice. A nodule usually moves up and down when you swallow, because it sits within the thyroid.
A minority of nodules produce excess thyroid hormone. This can cause symptoms of an overactive thyroid, such as palpitations, unintended weight loss, tremor, feeling hot, anxiety and difficulty sleeping. Rarely, if a nodule is associated with underlying thyroid inflammation, symptoms of an underactive thyroid may appear instead, such as tiredness, weight gain, feeling cold and low mood. A sudden increase in the size of a nodule, sometimes with tenderness, may occur if a cyst bleeds internally, and although this can feel alarming it is often not serious.
What causes it
Most thyroid nodules are benign. Common causes include simple overgrowths of normal thyroid tissue (sometimes called colloid nodules or adenomas), fluid-filled cysts, and changes related to thyroiditis (inflammation of the gland). Multiple nodules together are often described as a multinodular goitre. Iodine intake plays a role in gland behaviour, and in some people a nodule becomes “overactive”, making hormone independently of the body’s normal controls. A small proportion of nodules are thyroid cancer. When cancer does occur it is, in most cases, a slow-growing type that is highly treatable with a good long-term outlook, which is why timely assessment rather than alarm is the aim.
Who is at risk
Thyroid nodules become more common with increasing age and are found more often in women. Most nodules arise without any identifiable cause. Certain factors raise the small chance that a nodule is cancerous rather than benign: a history of radiation exposure to the head or neck (for example, radiotherapy in childhood), a family history of thyroid cancer or certain inherited syndromes, and being at the younger or older ends of the age range. Having a nodule detected does not mean cancer is likely; these factors simply help a doctor decide how closely a particular nodule should be examined.
How it is diagnosed
Evaluation usually begins with an examination of the neck, feeling the size, firmness and mobility of the nodule and checking for enlarged neck glands. A thyroid blood test measures thyroid function to see whether the gland is overactive, underactive or normal. An ultrasound is the key imaging test: it describes the nodule’s size, whether it is solid or cystic, and features such as its shape, margins, and any calcifications that help estimate the risk of cancer and decide whether a biopsy is needed.
If the ultrasound features are suspicious, or the nodule is large enough to warrant sampling, a fine-needle aspiration (FNA) biopsy is performed. Using a thin needle, usually guided by ultrasound, a doctor takes a small sample of cells from the nodule for examination under a microscope. This is a quick outpatient procedure that determines whether the nodule is benign, suspicious, or malignant. Occasionally, if a nodule is overactive on blood tests, a specialist may arrange a nuclear medicine (uptake) scan to see how it is behaving. An endocrinologist or an ENT (head and neck) surgeon typically coordinates this assessment.
When a nodule is more concerning
Most features that make a nodule benign are reassuring, but certain signs prompt closer and more prompt assessment. These include a nodule that is growing rapidly, a lump that feels hard and fixed to surrounding tissue rather than moving freely, new or persistent hoarseness or voice change, difficulty swallowing or breathing, and a neck lump accompanied by enlarged, firm glands in the neck. None of these signs proves cancer, but they mean a doctor should evaluate the nodule sooner rather than later so that appropriate tests can be arranged.
Treatment
Treatment depends entirely on what the assessment shows, and for many people no active treatment is needed. Monitoring is the usual approach for a benign nodule that is small and causing no symptoms: it is followed with periodic ultrasound to check for any change in size or features, and only reassessed further if it grows or new features appear.
If blood tests show the thyroid is over- or underactive, that hormonal imbalance is treated. An overactive nodule may be managed with medication (a class of drugs that reduce hormone production), radioactive iodine, or surgery, depending on the situation. For a benign nodule that is large and causing pressure symptoms or cosmetic concern, options may include minimally invasive treatments that shrink the nodule or surgery to remove part of the gland. Surgery is recommended when a nodule is large and symptomatic, growing, suspicious on biopsy, or confirmed to be cancer; the extent of surgery is tailored to the findings. When a nodule is cancerous, treatment is usually very effective and coordinated by a specialist team. A doctor advises the most suitable option based on the biopsy result, blood tests and ultrasound.
Living with it
Many people live with a benign thyroid nodule for years and require nothing more than occasional review. If your doctor has recommended monitoring, keep to the scheduled ultrasound appointments and thyroid blood tests, as these are how any change is picked up early. Between reviews, it is worth being aware of your neck and seeking earlier assessment if you notice the lump enlarging, a new hard area, voice change, or increasing difficulty swallowing. If you are taking medication for an over- or underactive thyroid, take it as prescribed and attend follow-up so doses can be adjusted. A nodule that has been fully assessed and found to be benign is generally not a cause for ongoing worry.
When to see a doctor
See a GP, polyclinic doctor or specialist for any new lump in the front of the neck, a persistent change in the neck’s appearance, or difficulty swallowing, so the thyroid can be examined and assessed. Seek prompt review for a rapidly growing lump, a hard fixed lump, new hoarseness, or a neck lump with enlarged glands. Sudden difficulty breathing, severe difficulty swallowing, or a rapidly enlarging neck swelling that affects the airway are emergencies — call 995 or go to the nearest emergency department. Reliable general information is also available on HealthHub, Singapore’s national health portal.
Common questions
Are most thyroid nodules cancer?
No. The large majority are benign; assessment identifies the small number that need closer attention.
Do thyroid nodules need to be removed?
Often not. Many are monitored; removal is considered for growing, symptomatic, overactive or suspicious nodules.
How is a thyroid nodule checked?
Usually with an examination, a thyroid blood test, an ultrasound, and sometimes a fine-needle biopsy.
Is a fine-needle biopsy painful?
It is a quick outpatient procedure using a thin needle, often with ultrasound guidance. Most people find the discomfort brief and comparable to a blood test.
Will a thyroid nodule affect my hormone levels?
Most do not. A minority make excess hormone, causing an overactive thyroid; a blood test checks how your gland is working.
Which doctor should I see?
A GP or polyclinic doctor can examine the neck and arrange initial tests, and refer you to an endocrinologist or ENT specialist if further assessment or a biopsy is needed.
Related guides
Sources
- HealthHub Singapore — thyroid conditions.
- Society of Otolaryngology Singapore — thyroid nodules.
- American Thyroid Association — thyroid nodules.
This article is for general information only and does not replace a consultation with a qualified doctor. Please seek personalised medical advice for your situation.