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Thyroid cancer

Also known as: Malignant neoplasms of thyroid gland, unspecified

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In short

Malignant neoplasms of the thyroid gland, or thyroid cancers, are cancers that start in the tissues of the thyroid, a small gland in the front of the neck that produces hormones controlling how the body uses energy. The main types of thyroid cancer include differentiated thyroid cancer, medullary thyroid cancer, and anaplastic thyroid cancer. Symptoms may not appear at first, but as the cancer grows, they can include a lump in the neck, trouble breathing, trouble or pain when swallowing, and persistent hoarseness or voice changes. Depending on the type and spread of the cancer, treatment options include surgery, radiation therapy, chemotherapy, thyroid hormone therapy, targeted therapy, or watchful waiting.

Source: MedlinePlus, National Library of Medicine.

AI-generated summary of the sources cited on this page, checked automatically against them. Not reviewed by a clinician; not medical advice.

Codes

ICD-10
C73
ICD-11
2D10.Z Malignant neoplasms of thyroid gland, unspecified

Description

What is thyroid cancer?

Thyroid cancer is a cancer that starts in the tissues of the thyroid. Your thyroid is a small, butterfly-shaped gland in the front of your neck. It makes hormones that control the way the body uses energy. These hormones affect nearly every organ in your body and control many of your body's most important functions. For example, they affect your breathing, heart rate, weight, digestion, and moods.

What are the different types of thyroid cancer?

There are different types of thyroid cancer; the main ones include:

  • Differentiated thyroid cancer, which includes papillary cancer and follicular cancer
  • Medullary thyroid cancer
  • Anaplastic thyroid cancer

Who is more likely to develop thyroid cancer?

Certain people are more likely to develop thyroid cancer. Your risk is higher if you:

  • Are between ages 25 and 65
  • Are a woman
  • Are Asian
  • Were exposed to certain types of radiation, including from radiation treatments to your head or neck as a child or from a radiation emergency
  • Have had a goiter (enlarged thyroid)
  • Having certain genetic conditions, including certain types of multiple endocrine neoplasia
  • Have a family history of thyroid cancer or thyroid disease

What are the symptoms of thyroid cancer?

Thyroid cancer may not cause symptoms at first. It is sometimes found during a routine physical exam. You may get signs or symptoms as the cancer gets bigger. The symptoms may include:

  • A lump (nodule) in the neck
  • Trouble breathing
  • Trouble swallowing
  • Pain when swallowing
  • Hoarseness or other changes to your voice that do not get better

How is thyroid cancer diagnosed?

To find out if you have thyroid cancer, your health care provider may use:

  • A physical exam, including checking your neck for swelling, lumps, or anything that seems unusual
  • A medical history
  • Thyroid tests
  • Other blood or imaging tests
  • A biopsy

What are the treatments for thyroid cancer?

Treatment for thyroid cancer depends on the type of cancer you have and whether the cancer has spread. Often, more than one type of treatment may be needed. The treatment options include:

  • Surgery.
  • Radiation therapy, including radioactive iodine therapy.
  • Chemotherapy.
  • Thyroid hormone therapy.
  • Targeted therapy, which uses drugs or other substances that attack specific cancer cells with less harm to normal cells.
  • Watchful waiting, which means that you don't get treatment right away. Your regularly checks to see if your signs or symptoms appear or change.

NIH: National Cancer Institute

Source: MedlinePlus, National Library of Medicine.

Related terms in the cited sources

Medicines with an official indication for this condition

In alphabetical order.

Next to it in ICD-10

Neighbouring codes in the classification, not a medical link.

External resources

Questions

What is the ICD-10 code for Thyroid cancer?

C73 (WHO, International Classification of Diseases, 10th Revision).

What is the ICD-11 code for Thyroid cancer?

2D10.Z: Malignant neoplasms of thyroid gland, unspecified (WHO, ICD-11 for Mortality and Morbidity Statistics).

Sources and attribution

  • ICD-11 for Mortality and Morbidity Statistics, © World Health Organization, licensed under CC BY-ND 3.0 IGO.
  • Names other than the official source titles: Anpheros translations and plain-language names, made with AI assistance and checked automatically; the source names are in English.
  • Source: MedlinePlus, National Library of Medicine.
  • Source: European Medicines Agency (EMA) — EPAR. © European Medicines Agency.
  • ICD-10 codes and titles © World Health Organization. Source: WHO, International Classification of Diseases, 10th Revision (2019).

Anpheros Search catalog 2026.10.5, published 17 October 2026. About the data →