Thyroid nodules are growths that develop within the thyroid gland and are extremely common, particularly in adults over the age of 40. While most thyroid nodules are benign and do not cause symptoms, some may affect hormone production or require evaluation to rule out cancer.
At Saint John’s Health Center, our Endocrine Center of Excellence offers comprehensive evaluation and personalized care for all types of thyroid nodules—from benign cysts to nodules requiring biopsy, monitoring, or treatment. Our team focuses on accurate diagnosis, thoughtful management, and long-term thyroid health.
What Are Thyroid Nodules?
Thyroid nodules are solid or fluid-filled growths that form within the thyroid gland, located at the base of the neck. Nodules vary in size, composition, and activity, and many are discovered incidentally during routine physical exams or imaging studies. Although the majority of thyroid nodules are noncancerous, a small percentage may represent thyroid cancer
Thyroid nodules can become problematic, causing a cariety of symptoms as they continue to grow. Understanding the characteristics of a nodule helps guide appropriate evaluation, follow-up, and treatment when needed. Nodules are more common with age and occur more frequently in women.
Causes of Thyroid Nodules
Thyroid nodules can develop for several reasons, ranging from benign tissue changes to inflammatory conditions or, less commonly, cancer. Identifying the underlying cause helps determine whether a nodule can be safely monitored or requires further evaluation.
Benign Thyroid Growths
Many thyroid nodules result from benign overgrowth of normal thyroid tissue. These nodules often remain stable over time and do not interfere with thyroid function or overall health.
Thyroid Cysts
Thyroid cysts are fluid-filled nodules that may form as thyroid tissue breaks down. They can fluctuate in size and may occasionally cause discomfort or visible swelling in the neck.
Thyroiditis
Inflammation of the thyroid gland, known as thyroiditis, can lead to temporary thyroid enlargement or the development of nodules. In some cases, inflammation resolves on its own, while others require monitoring or treatment.
Iodine Deficiency
Iodine deficiency can contribute to thyroid nodule formation, although this is uncommon in the United States due to iodine supplementation in food. When present, iodine imbalance may affect overall thyroid health.
Radiation Exposure
Prior exposure to radiation involving the head, neck, or chest—particularly during childhood—can increase the risk of developing thyroid nodules later in life. Radiation exposure may come from medical treatments or environmental sources and is an important factor considered during thyroid evaluation.
Family History
A family history of thyroid nodules, thyroid disease, or thyroid cancer can increase an individual’s risk of developing nodules. Genetic factors may influence how thyroid tissue grows, making family history an important consideration when determining the need for evaluation and follow-up.
Thyroid Cancer
A small percentage of thyroid nodules are cancerous. These nodules require careful evaluation, biopsy, and—when necessary—timely treatment to ensure the best possible outcomes.
Signs and Symptoms of Thyroid Nodules
Most thyroid nodules do not cause symptoms and are often discovered incidentally. However, symptoms may develop if a nodule grows large, presses on nearby structures, or affects hormone production.
- Difficulty swallowing
- A visible or palpable lump in the neck
- Hoarseness or voice changes
- Throat pressure or discomfort
- Difficulty breathing, especially when lying down
- Symptoms of hyperthyroidism if the nodule produces excess hormone
Because many nodules are asymptomatic, medical evaluation is important even in the absence of symptoms.
How Are Thyroid Nodules Diagnosed?
Diagnosing thyroid nodules involves a combination of clinical examination, imaging, blood tests, and—when indicated—biopsy. This stepwise approach helps determine whether a nodule is benign or requires treatment.
Physical Examination
Your provider will examine the neck to assess for swelling, tenderness, asymmetry, or enlarged lymph nodes. Medical history and risk factors are also reviewed to guide further testing.
Thyroid Function Blood Tests
Blood tests such as TSH, Free T4, and thyroid antibody levels help determine whether the nodule is affecting thyroid hormone production. These results guide treatment decisions and further evaluation.
Thyroid Ultrasound
Ultrasound is the most accurate tool for evaluating thyroid nodules. It provides detailed information about nodule size, composition, and features that may suggest cancer, as well as the presence of abnormal lymph nodes.
Fine-Needle Aspiration (FNA) Biopsy
Fine-needle aspiration biopsy is a minimally invasive procedure used to sample cells from a thyroid nodule. Ultrasound-guided FNA is recommended for nodules with suspicious features or those that meet size thresholds.
When Is a Thyroid Nodule Concerning?
While most thyroid nodules are benign, certain features may indicate the need for biopsy or treatment.
- Rapid growth
- Suspicious ultrasound characteristics
- Abnormal lymph nodes in the neck
- Compression-related symptoms
- A family history of thyroid cancer
Early evaluation helps identify nodules that require closer monitoring or intervention.
Treatment and Management of Thyroid Nodules
Management depends on the nodule’s size, characteristics, symptoms, and impact on thyroid function. Many nodules require no immediate treatment and can be safely monitored.
Observation and Monitoring
Small, benign nodules without symptoms are often monitored with periodic ultrasound exams and clinical follow-up to ensure stability over time.
Radiofrequency Ablation
Thyroid Radiofrequency Ablation (RFA) is a minimally-invasive procedure that can dramatically reduce the size of one or more nodules. It is designed to preserves your healthy thyroid tissue and allows it to function normally without the need for a lifetime of medication. RFA is performed under local anesthesia. Learn more abour RFA Ablation for Thyroid Nodules.
Medication
If thyroid hormone levels are abnormal, medication may be prescribed to manage overactive or underactive thyroid function related to the nodule.
Radioactive Iodine
Hyperfunctioning nodules that produce excess thyroid hormone may be treated with radioactive iodine to reduce hormone production and alleviate symptoms.
Surgery
Surgical removal may be recommended for nodules that are cancerous, suspicious, rapidly growing, or causing compressive symptoms. Minimally invasive approaches are used when appropriate.
Living With Thyroid Nodules
Most people with thyroid nodules live healthy lives without the need for treatment. Long-term care may include repeat ultrasounds, thyroid function testing, and clinical evaluations to ensure nodules remain stable.
Your personalized care plan considers symptoms, nodule type, and overall thyroid health, with a focus on ongoing support and reassurance.
Prognosis and Long-Term Outlook
The outlook for individuals with thyroid nodules is excellent. Most nodules are benign and do not impact long-term health, and many require only periodic monitoring. When thyroid cancer is identified early, treatment outcomes are highly favorable.
Ongoing follow-up allows providers to detect changes promptly and adjust care when needed. At Saint John’s, patients benefit from coordinated, personalized care focused on long-term thyroid health, early detection, and peace of mind.
Catherine explains her thyroid nodule treatment using Radiofrequency Ablation.
Radiofrequency Ablation for Benign Thyroid Nodules is an outpatient procedure.
If you have questions regarding thyroid nodules, diagnosis, or treatment, please call today. Click here to request an appointment.
