Young Adult Thyroid Cancer: What You Need to Know
Thyroid cancer is one of the more common cancers diagnosed in young adults, particularly among young women. A diagnosis can be especially difficult at a time when people are establishing careers, relationships and families, but most young adults with differentiated thyroid cancer have an excellent outlook. Understanding how thyroid cancer is evaluated and treated can help you make informed decisions about your care.
Learn more about cancer in adolescents and young adults from the American Cancer Society.
Thyroid Cancer Can Affect Young Adults
Thyroid cancer can occur at any age, but it is an important cancer in adolescents and young adults. Young adults may also have concerns that are particularly relevant to their stage of life, including fertility, pregnancy, work, school and long-term health.
Most thyroid cancers are differentiated thyroid cancers, including papillary and follicular thyroid cancers. Other types, including medullary and anaplastic thyroid cancers, behave differently and may require different approaches to treatment.
How Is Thyroid Cancer Discovered?
Thyroid cancer may not cause symptoms in its early stages. A thyroid nodule or cancer may be discovered during a physical examination or incidentally on imaging performed for another reason. When symptoms do occur, they can include a lump or swelling in the neck, persistent hoarseness or other voice changes, difficulty swallowing or difficulty breathing. These symptoms can also have causes other than thyroid cancer.
There is no standard routine screening test for thyroid cancer in people without symptoms. An ultrasound or other evaluation may be appropriate when a thyroid abnormality is found or when there are clinical reasons to investigate the thyroid or neck.
Learn more about thyroid nodules and their evaluation.
How Is Thyroid Cancer Diagnosed?
Evaluation generally begins with a medical history and examination, followed by appropriate thyroid and neck imaging. Ultrasound can show the size and characteristics of a thyroid nodule and can help evaluate nearby lymph nodes.
Not every thyroid nodule requires a biopsy. When ultrasound findings and other clinical factors indicate that additional evaluation is appropriate, an ultrasound-guided fine-needle aspiration (FNA) may be performed. The decision to biopsy is based on the nodule’s characteristics and clinical context rather than simply the fact that a nodule exists.
If cancer is confirmed, additional evaluation determines the type and extent of the disease. These findings help the care team estimate the risk of recurrence and determine which treatments, if any, are appropriate.
Does Every Young Adult With Thyroid Cancer Need Surgery?
No. Surgery remains an important treatment for many thyroid cancers, but not every thyroid cancer requires immediate surgery.
For selected small, low-risk papillary thyroid cancers, active surveillance may be an option. Instead of removing the cancer immediately, the patient undergoes planned monitoring with ultrasound and clinical evaluation, with treatment reconsidered if the cancer shows concerning changes. The decision to pursue active surveillance should take into account the cancer’s characteristics as well as the patient’s preferences, ability to maintain follow-up and access to appropriate imaging and clinical care.
When surgery is recommended, the extent of surgery is individualized. The 2025 American Thyroid Association guidelines recommend lobectomy for appropriately selected differentiated thyroid cancers confined to one thyroid lobe that are 2 centimeters or smaller without extension outside the thyroid or spread to lymph nodes. For selected cancers larger than 2 and up to 4 centimeters, either lobectomy or total thyroidectomy may be appropriate depending on the cancer’s features, findings in the other thyroid lobe and patient preference.
More extensive disease may require total thyroidectomy and treatment of involved lymph nodes or other areas of disease. The goal is to treat the cancer effectively while avoiding unnecessary treatment when a less extensive approach is appropriate.
Learn more about thyroidectomy and thyroid surgery.
Will I Need Radioactive Iodine?
Radioactive iodine (RAI) is not automatically needed after thyroid surgery.
RAI may be recommended for some patients with differentiated thyroid cancer when the potential benefit of treating remaining thyroid cancer cells outweighs the risks and burdens of treatment. The decision depends on the cancer’s characteristics, extent of disease, risk of recurrence and response to initial treatment. Current guidelines have moved toward more selective use of RAI rather than routine treatment for low-risk disease.
For young adults, the decision can be particularly important because they may have many decades of life ahead. RAI can affect reproductive health, and pregnancy must be avoided for a period after treatment. People who may need RAI should discuss fertility and family-planning goals with their care team before treatment.
Learn more about radioactive iodine from the American Thyroid Association.
What About Fertility, Pregnancy and Family Planning?
Questions about fertility and future pregnancy are an important part of thyroid cancer care for many young adults.
Thyroid hormone is essential during pregnancy, and thyroid hormone levels can be monitored and managed before and during pregnancy. Patients who have had thyroid surgery or who take thyroid hormone replacement should discuss pregnancy planning with their endocrinologist so that thyroid function can be appropriately monitored and treatment adjusted when necessary.
If radioactive iodine is recommended, reproductive considerations should be discussed before treatment. RAI should not be given during pregnancy or while breastfeeding, and pregnancy should be delayed after I-131 treatment. The appropriate timing should be discussed with the treating physician.
For men who may receive repeated or higher doses of RAI, sperm banking may also be considered.
What Happens After Treatment?
Thyroid cancer care does not necessarily end after surgery or other initial treatment.
Follow-up is individualized according to the type of cancer, the treatment received, the risk of recurrence and the patient’s response to treatment. Depending on the circumstances, monitoring may include physical examinations, thyroid hormone testing, thyroglobulin and thyroglobulin-antibody testing, neck ultrasound or other imaging.
The 2025 American Thyroid Association guidelines emphasize reassessing risk over time. A patient who has an excellent response to treatment may require less intensive monitoring or treatment over time, while evidence of persistent or recurrent disease may lead to additional evaluation or treatment.
What Is the Outlook for Young Adults With Thyroid Cancer?
The outlook for most young adults with differentiated thyroid cancer is excellent. Thyroid cancer is among the cancers with particularly high survival among young adults, although prognosis varies according to the type of thyroid cancer, extent of disease and other individual factors.
An excellent prognosis does not mean that every patient has the same experience. Some young adults may require more extensive treatment or long-term monitoring, and recurrence can occur even when the initial prognosis is favorable. The goal is to provide the level of treatment and follow-up appropriate for the individual’s disease while limiting unnecessary treatment and its long-term effects.
Young Adult Thyroid Cancer Care Should Consider the Whole Person
A thyroid cancer diagnosis can affect much more than medical decisions. Young adults may be balancing college or career, relationships, parenting, fertility plans, finances and other responsibilities while undergoing diagnosis and treatment.
A coordinated care team can help patients understand their diagnosis, compare treatment options, prepare for surgery or other treatment, manage thyroid hormone needs and plan appropriate long-term follow-up. For patients who need additional support, cancer survivorship and support services can also be an important part of care.
Questions to Ask Your Thyroid Cancer Care Team
- What type of thyroid cancer do I have?
- How large is the cancer, and is it confined to the thyroid?
- Are any lymph nodes or other areas involved?
- What is my estimated risk of recurrence?
- Do I need treatment now, or could active surveillance be appropriate?
- If I need surgery, would a lobectomy or total thyroidectomy be appropriate?
- Will I need thyroid hormone replacement?
- Would radioactive iodine provide a meaningful benefit in my situation?
- Could treatment affect my fertility or plans for pregnancy?
- What will my follow-up and long-term monitoring involve?
- What support is available for the practical and emotional challenges of cancer during young adulthood?
Young Adult Thyroid Cancer Care at Saint John’s
The Center for Endocrine Tumors and Disorders at Saint John’s provides evaluation and treatment for thyroid nodules and thyroid cancer, bringing together endocrine surgery and endocrinology as appropriate to the patient’s needs. Treatment and follow-up are tailored to the diagnosis, the extent and risk of the cancer, and the individual patient’s circumstances.
Explore the Center for Endocrine Tumors and Disorders.
Learn more about thyroid cancer, including diagnosis, treatment and follow-up.
Explore cancer support and survivorship resources for patients and families.
Hear From Dr. Melanie Goldfarb
In this interview, Dr. Melanie Goldfarb discusses questions that young adults may have about thyroid cancer, including diagnosis, treatment, surgery and long-term considerations.
Dr. Melanie Goldfarb discusses thyroid cancer and treatment considerations for young adults.
Sources & Further Reading
- American Thyroid Association
- National Cancer Institute — Thyroid Cancer
- American Cancer Society — Thyroid Cancer
- American Cancer Society — Cancer in Adolescents and Young Adults