Just been diagnosed with thyroid cancer? You're not alone, and there's a clear path forward.

Hearing the word "cancer" is hard, even when your team tells you that most thyroid cancers grow slowly and respond very well to treatment. You may have questions about surgery, radioactive iodine and taking thyroid hormone pills. Here you'll find clear, friendly guides for you and your family, one step at a time.

Updated September 30, 2026

In an emergency, call 9-1-1 or your local emergency number.

Start here

Your first 30 days: a checklist

Save the phone numbers of your surgeon's office, your cancer centre and any after-hours line.
Ask what type of thyroid cancer you have, and whether it has spread to lymph nodes in your neck.
Bring a family member or friend to appointments, and write down questions before each visit.
Before surgery, ask about your voice, calcium levels, and whether you will need thyroid hormone pills afterwards.
If you start levothyroxine, take it the same way every day, and don't stop it without talking to your team.
Ask whether you might need radioactive iodine, and if so, what the low-iodine diet and safety steps involve.
If you have medullary thyroid cancer, ask about genetic testing for you and your family.
Tell your team if you feel low, worried or can't sleep for more than two weeks.

Your first weeks after a cancer diagnosis: A calm, step-by-step guide to the first weeks after being told you have cancer: getting organized, understanding your diagnosis, planning treatment and finding support. (6 min read)

Understand it

Thyroid Cancer, Explained: a longer guide for you and your family (video coming soon)

Understanding thyroid cancer: What thyroid cancer is, the main types in plain words (papillary, follicular, medullary and anaplastic), how it is staged, and the tests you may have. (5 min read)

Your treatment

Cancer Surgery, Explained: removing the cancer, and getting ready (video coming soon)
Radiation Therapy, Explained: focused energy aimed at cancer cells (video coming soon)
Targeted Therapy and Biologics: medicines aimed at a cancer's weak spots (video coming soon)

Treatment options for thyroid cancer: A plain-language guide to active surveillance, thyroid surgery, radioactive iodine, thyroid hormone pills, radiation and targeted drugs, and how your team chooses. (6 min read)
Clinical trials explained: What cancer clinical trials are, how the phases work, what randomization and placebos mean, how you are protected, and how to find a trial that might suit you. (6 min read)

Living well

What Exercise Does for Your Body: and how much you really need (video, 4:38)

Managing side effects of cancer treatment: Practical, friendly tips for common side effects of cancer treatment: tiredness, nausea, mouth sores, hair loss, numbness and tingling, skin changes, low blood counts and "chemo brain." Report them, don't just endure them. (7 min read)
Eating well during cancer treatment: Practical tips for eating well during cancer treatment: getting enough protein and energy, coping with poor appetite, nausea and taste changes, food safety, and what to know about supplements. (6 min read)
Your feelings matter: emotional health and support with cancer: Fear, sadness, anger and worry are common after a cancer diagnosis. Practical ways to cope, when to ask for help, crisis support (9-8-8), talking with family, and support for caregivers. (6 min read)
Work, money and practical matters: Practical help after a cancer diagnosis: telling your employer, time off and benefits, fertility preservation before treatment, getting to appointments, and keeping paperwork in order. (6 min read)

When to get help

Call 9-1-1 now

Swelling in your neck that grows quickly, especially in the first day or two after surgery
Trouble breathing, noisy or high-pitched breathing, or a feeling that your throat is closing
Bleeding from your neck wound that doesn't stop with firm pressure
Severe muscle spasms or cramps, a hand or face that locks in a cramp, or a seizure (signs of very low calcium)
Chest pain or pressure
Fainting, severe dizziness or new confusion
Signs of a severe allergic reaction: swelling of the lips, tongue or face, or hives with trouble breathing
Fever with feeling very unwell, confusion, fainting or trouble breathing while on chemotherapy or targeted therapy

Call 9-1-1 or your local emergency number. Don't drive yourself.

Call your cancer centre now

Tingling or numbness around your mouth, in your fingers or toes, or mild muscle cramps after surgery (signs of low calcium): call right away
If you're on chemotherapy or targeted therapy: a temperature of 38 °C (100.4 °F) or higher. Call your cancer centre's 24-hour line right away. If you can't reach them, go to emergency
A hoarse, weak or breathy voice that isn't getting better, or coughing or choking when you drink
Trouble swallowing that is getting worse
Redness, warmth, swelling, pus or discharge at your neck wound
Signs your thyroid hormone dose may need adjusting: a racing or pounding heart, shakiness or trouble sleeping, or feeling very tired, cold, slowed down or gaining weight
After radioactive iodine: painful swelling near your jaw or in your neck, a very dry mouth, or nausea or vomiting that doesn't settle
On targeted therapy: high blood pressure readings, diarrhea that doesn't settle, or sore, red or blistered hands or feet
Low mood or worry that lasts more than two weeks

Use the 24-hour line. Don't wait for your next appointment. If you can't reach anyone and you're worried, go to emergency.

If you have any of the emergency signs, call 9-1-1 or your local emergency number right away. Don't drive yourself to the hospital. For other worries, call your surgeon's office or your cancer centre. If you're on chemotherapy or targeted therapy, keep your cancer centre's 24-hour number where you can find it. If you're not sure whether something is serious, call. Your team would much rather hear from you early.

Fever and when to get help during cancer treatment: Clear lists to help you decide: a fever of 38.0 °C (100.4 °F) during chemotherapy is an emergency. Plus when to call 9-1-1, when to call your cancer centre's 24-hour line, and immunotherapy side effects to report. (6 min read)

Questions to ask your team

A printable list of questions to bring to your next appointment.

Go deeper

Written for clinicians and students. More technical material from Hibbert Medical, for readers who want more detail.

Podcast summaries

Endocrinology podcasts: Hormone specialists on the thyroid and more, each with a written summary.
Cancer podcasts, summarized: Cancer podcasts with written summaries.
Mental health podcasts: Stress, mood and coping with a serious illness.

Lectures

Thyroid Nodules and Cancer: Medical school: thyroid lumps and the main types of thyroid cancer.
Thyroid Nodules and Thyroid Cancer: Residency endocrinology: work-up and treatment.
Thyroid Nodules and Thyroid Cancer: Surgery: When and how the thyroid is removed.
Differentiated Thyroid Cancer: Post-Surgical I-131 Therapy: Radioactive iodine after surgery.
Thyroid Cancer Surveillance: Thyroglobulin and Diagnostic Scans: Blood tests and scans in follow-up.

Clinical cases

Papillary Thyroid Carcinoma: The most common thyroid cancer, from lump to surgery.
Thyroid Cancer Radioiodine Therapy: What radioactive iodine treatment involves.
Follicular Thyroid Carcinoma: Another common type, and how it is diagnosed.
Medullary Thyroid Carcinoma with MEN2A: A rarer, sometimes inherited thyroid cancer.

Oncology regimen tutorials

Monoclonal antibodies and biologics in oncology: Special tutorial: mechanisms, antibody–drug conjugates, bispecifics and class toxicities.

Common questions

What is thyroid cancer?

Thyroid cancer starts in the thyroid, a butterfly-shaped gland at the front of your neck that makes hormones to control how your body uses energy. It happens when cells in the gland start to grow out of control and form a lump (tumour). There are several types. The most common types, papillary and follicular, usually grow slowly and respond very well to treatment.

Will I need surgery?

Most people with thyroid cancer have surgery. Some have one half of the thyroid removed (a lobectomy). Others have the whole gland removed (a total thyroidectomy), sometimes along with nearby lymph nodes. For some very small, low-risk papillary cancers, your team may offer active surveillance instead, which means watching the cancer closely with regular ultrasounds. Your team will help you choose what fits you.

Will I have to take pills for the rest of my life?

If your whole thyroid is removed, you will need to take a thyroid hormone pill called levothyroxine every day for life. It replaces the hormone your thyroid used to make. If only half is removed, the other half may make enough hormone on its own. Your team will check your blood levels and adjust your dose over time.

What is radioactive iodine, and do I need it?

Thyroid cells take up iodine. Radioactive iodine uses this to find and destroy thyroid cells left after surgery, including some cancer cells. It is usually given as a capsule or drink. Not everyone needs it. It is used for some papillary and follicular cancers, depending on the risk of the cancer coming back. It is not used for medullary or anaplastic thyroid cancer.

Is it normal to feel upset when people call it a "good cancer"?

Yes. Even when the outlook is very good, a cancer diagnosis is still a big deal. Surgery, scars, voice changes, tiredness and hormone ups and downs are real. Your feelings are valid. Talk with your care team about how you're coping, and ask about support groups. If you are thinking about suicide, call or text 9-8-8 in Canada or the U.S., or call 9-1-1.

Sources for this page

Back to Cancer: types of treatment, side effects and support for any cancer

General information, not medical advice. It does not replace your own care team. If you think you or someone else is having a medical emergency, call 9-1-1 or your local emergency number. If you are in crisis or thinking about suicide, call or text 9-8-8 (Canada and the US).

All After a Diagnosis guides