A rapidly enlarging neck mass, especially when accompanied by breathing or swallowing difficulties, requires urgent medical assessment.
Who Has a Higher Risk of Thyroid Cancer?
Thyroid cancer can occur at almost any age, but certain factors are associated with a higher risk.
1. Previous radiation exposure
Exposure of the head or neck to ionizing radiation, particularly during childhood, is an established risk factor.
This may include certain historical medical radiation treatments.
Modern diagnostic imaging uses carefully controlled doses, and an individual risk assessment depends on the type, dose, timing, and number of exposures.
2. Family history
Having close relatives with thyroid cancer may increase risk.
The importance of family history depends on the type of thyroid cancer and whether an inherited genetic condition is present.
Medullary thyroid cancer is particularly important because some cases are associated with inherited RET gene mutations.
3. Certain inherited genetic conditions
Some genetic conditions are associated with a higher likelihood of developing particular thyroid cancers.
Examples include:
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Multiple endocrine neoplasia type 2.
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Familial medullary thyroid cancer.
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Certain familial cancer syndromes.
People with a strong family history may benefit from discussing genetic counseling with a specialist.
4. Age and sex
Thyroid cancer is diagnosed more often in women than in men.
It can occur at many ages, although the likelihood and types of thyroid cancer vary across age groups.
Age and sex alone cannot determine whether an individual has the disease.
5. Thyroid nodules and goiter
Most thyroid nodules and cases of goiter are not cancerous.
However, some nodules have characteristics that require further investigation.
A clinician may use ultrasound features, medical history, and sometimes biopsy results to assess the likelihood of malignancy.
Having a benign thyroid condition does not automatically mean that cancer will develop.
How Is Thyroid Cancer Diagnosed?
If a healthcare professional suspects thyroid cancer, several tests may be used.
The choice depends on symptoms, physical findings, medical history, and ultrasound results.
Step 1: Medical history and physical examination
The doctor may ask:
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When did the symptoms begin?
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Has the neck lump changed in size?
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Is there difficulty swallowing or breathing?
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Has the voice changed?
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Is there a family history of thyroid cancer?
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Was there previous radiation exposure?
The doctor may then examine the thyroid gland and surrounding lymph nodes.
Step 2: Thyroid ultrasound
Ultrasound is one of the most important initial tests for evaluating thyroid nodules.
It uses sound waves to create images of the thyroid gland and nearby lymph nodes.
The scan can assess:
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Nodule size.
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Whether a nodule is solid or fluid-filled.
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Shape and margins.
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Internal appearance.
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Tiny calcifications.
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Suspicious lymph node features.
Certain ultrasound patterns are more concerning than others.
However, ultrasound cannot confirm cancer by itself.
Step 3: Fine-needle aspiration biopsy
If a nodule has suspicious features or meets appropriate size criteria, a doctor may recommend fine-needle aspiration, often called FNA.
During this procedure, a very thin needle is used to collect cells from the thyroid nodule.
The cells are examined under a microscope.
FNA is commonly used to determine whether a nodule appears benign, suspicious, malignant, or indeterminate.
Not every thyroid nodule needs a biopsy. The decision depends on ultrasound findings, size, risk factors, and clinical judgment.
Step 4: Blood tests
Blood tests may include thyroid-stimulating hormone, or TSH, and thyroid hormone measurements.
These tests help assess thyroid function.
However, normal thyroid hormone levels do not rule out thyroid cancer.
Calcitonin testing may be considered when medullary thyroid cancer is suspected or when there is a relevant family history.
Step 5: Additional imaging when needed
Depending on the findings, doctors may recommend additional imaging such as CT, MRI, or other specialized scans.
These tests can help assess the extent of disease and whether nearby structures are involved.
How Is Thyroid Cancer Treated?
Treatment depends on the type of cancer, tumor size, whether it has spread, the patient's age, overall health, and individual preferences.
Not every patient needs the same treatment.
Surgery
Surgery is a common treatment for many thyroid cancers.
Depending on the case, the surgeon may remove:
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Part of the thyroid gland, known as a lobectomy.
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Most or all of the thyroid gland, known as a thyroidectomy.
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Certain affected lymph nodes in the neck.
The extent of surgery depends on the cancer's characteristics and the risk of recurrence.
Radioactive iodine treatment
Some patients with differentiated thyroid cancer, particularly selected papillary and follicular cancers, may receive radioactive iodine after surgery.
Thyroid cells can absorb iodine, and radioactive iodine can destroy remaining thyroid tissue or certain cancer cells.
It is not appropriate for every patient and is not generally effective for all types of thyroid cancer.