Thyroid cancer occurs in the cells of the thyroid, a butterfly-shaped gland situated at the base of your neck, just below the Adam's apple. Your thyroid makes hormones that regulate your heart rate, blood pressure, body infection, and weight.
Thyroid cancer may not cause any symptoms at first. But as it grows, it can cause pain and swelling in the neck.
There are several types of thyroid cancer. Some grow very slowly and others can be very violent. Most belongings of thyroid cancer can be cured with treatment.
Thyroid cancer rates appear to be increasing. Some doctors believe this is because new technology allows them to find small thyroid cancers that may not have been found in the past.
Symptoms Thyroid cancer
Thyroid cancer does not usually cause any signs or symptoms early in the disease. As thyroid cancer grows, it can cause:
- A lump (nodule) that can be felt through the skin on the neck.
- Changes in your voice, including increased hoarseness
- Difficulty to swallow
- Pain in the neck and throat
- Swollen lymph nodes in your neck
Causes of Thyroid cancer
It is not clear what causes thyroid cancer.
Thyroid cancer occurs when cells in your thyroid feel inherited changes (mutations). Mutations allow cells to grow and multiply rapidly. Cells also lose the aptitude to die, as normal cells would. The accumulation of abnormal thyroid cells forms a tumor. The abnormal cells can invade nearby tissue and spread (metastasize) to other parts of the body.
Types of Thyroid cancer
- Papillary thyroid cancer. The most shared form of thyroid cancer, papillary thyroid cancer, arises from follicular cells, which crop and store thyroid hormones. Papillary thyroid cancer can occur at any age, but most often affects people in their 30s to 50s. Doctors sometimes refer to papillary thyroid cancer and follicular thyroid cancer collected as differentiated thyroid cancer.
- Follicular thyroid cancer. Follicular thyroid cancer also rises from the follicular cells of the thyroid. It usually affects societies over the age of 50. Hürthle cell cancer is a rare and potentially more aggressive type of follicular thyroid cancer.
- Anaplastic thyroid cancer. Anaplastic thyroid cancer is a rare type of thyroid cancer that begins in follicular cells. It grows quickly and is very difficult to treat. Anaplastic thyroid cancer usually occurs in adults 60 years of age or older.
- Medullary thyroid cancer. Medullary thyroid cancer begins in thyroid cells called C cells, which make the hormone calcitonin. Raised levels of calcitonin in the blood can specify medullary thyroid cancer at a very early stage. Certain genetic syndromes increase the risk of medullary thyroid cancer, although this genetic link is rare.
- Other rare types. Other very rare types of cancer that begin in the thyroid include thyroid lymphoma, which begins in cells of the thyroid immune system, and thyroid sarcoma, which begins in cells of the thyroid's connective tissue.
Diagnosis in Thyroid cancer
Tests and processes used to diagnose thyroid cancer include:
- Physical exam. Your doctor will observe your neck to feel for physical changes in your thyroid, such as thyroid nodules. They may also ask you about your risk factors, such as past radiation exposure and a family history of thyroid tumors.
- Blood test. Blood tests help determine if the thyroid gland is working normally.
- Ultrasound images. Ultrasound uses high-frequency sound waves to create images of body structures. To create an image of the thyroid, the ultrasound transducer is placed on the lower part of the neck. The arrival of your thyroid on ultrasound helps your doctor determine if a thyroid nodule is likely not cancerous (benign) or if there is a risk that it is cancerous.
- Removal of a sample of thyroid tissue. During a fine needle aspiration biopsy, your doctor inserts a long, thin needle through the skin to the thyroid nodule. Ultrasound imaging is typically used to precisely guide the needle to the nodule. Your specialist uses the needle to eliminate samples of suspicious thyroid tissue. The sample is tested in the laboratory to look for cancer cells.
Other imaging tests. You may have one or more imaging tests to help your doctor find out if your cancer has spread beyond the thyroid. Imaging tests can include CT, MRI, and nuclear imaging tests that use a radioactive form of iodine.
Genetic test. Some people with medullary thyroid cancer may have genetic changes that may be associated with other endocrine cancers. Your family history may lead your doctor to recommend genetic testing to look for genes that increase your risk of cancer.
Your thyroid cancer treatment options depend on the type and stage of your thyroid cancer, your general health, and your preferences.
Most thyroid cancers can be cured with treatment.
Treatment may not be needed right away
Very small thyroid cancers that have a low risk of spreading throughout the body may not need treatment right away. Instead, you might consider active surveillance with frequent cancer monitoring. Your doctor may recommend blood tests and an ultrasound exam of your neck once or twice a year.
In some people, the cancer may never grow and never require treatment. In others, eventually growth can be detected and treatment can be started.
Most people with thyroid cancer have surgery to remove the thyroid. Which operation your doctor may recommend depends on the type of thyroid cancer, the size of the cancer, whether the cancer has spread beyond the thyroid, and the results of an ultrasound exam of the entire thyroid gland.
Operations used to treat thyroid cancer include:
Removal of all or utmost of the thyroid (thyroidectomy). An operation to remove the thyroid gland may involve removing all of the thyroid tissue (total thyroidectomy) or most of the thyroid tissue (near-total thyroidectomy). The surgeon often leaves small borders of thyroid tissue around the parathyroid glands to reduce the risk of damage to the parathyroid glands, which help regulate calcium levels in the blood.
Removal of a portion of the thyroid (thyroid lobectomy). During a thyroid lobectomy, the surgeon eliminates half of the thyroid. It might be recommended if you have slow-growing thyroid cancer in one part of the thyroid and there are no suspicious nodules in other areas of the thyroid.
Removal of the lymph nodes in the neck (lymph node dissection). By removing the thyroid, the surgeon can also remove nearby lymph nodes in the neck. These can be tested for signs of cancer.
There is also a risk that the nerves connected to the vocal cords may not function normally after surgery, which can lead to vocal cord paralysis, hoarseness, voice changes, or shortness of breath. Treatment can improve or reverse nerve problems.
Thyroid hormone therapy
This medication has two benefits: it supplies the missing hormone that the thyroid would normally produce, and it suppresses the production of thyroid-stimulating hormone (TSH) from the pituitary gland. High levels of TSH could possibly stimulate the growth of the remaining cancer cells.
Radioactive iodine treatment uses large doses of a form of iodine that is radioactive.
Radioactive iodine treatment is frequently used after thyroidectomy to destroy any residual healthy thyroid tissue, as well as microscopic areas of thyroid cancer that were not removed during surgery. Radioactive iodine treatment can also be used to treat thyroid cancer that comes back after treatment or has spread to other areas of the body.
Side effects can include:
• Dry mouth
• Mouth pain
• Eye inflammation
• Altered sense of taste or smell
Most of the radioactive iodine leaves your body in your urine during the first few days after treatment. You will be given instructions on the precautions to take during this time to protect others from radiation. For example, you may be asked to temporarily avoid close contact with other people, especially children and pregnant women.
External radiation therapy
Radiation therapy can also be delivered externally by a machine that directs high-energy beams, such as x-rays and protons, to precise points on the body (external beam radiation therapy). During treatment, you lie still on a table while a machine changes about you.
Chemotherapy is drug treatment that uses chemicals to destroy cancer cells. Chemotherapy is usually given as an infusion through a vein. The chemicals travel throughout the body and destroy rapidly growing cells, including cancer cells.
Targeted drug therapy
Targeted drug treatments focus on specific abnormalities present in cancer cells. By delaying these abnormalities, targeted drug treatments can reason cancer cells to die.
Injecting alcohol into cancers
Alcohol ablation involves injecting alcohol into small thyroid cancers using imaging such as ultrasound to ensure accurate injection placement. This procedure causes thyroid cancers to shrink.
Supportive (palliative) care
Palliative care is specialized medical care that focuses on providing relief from pain and other symptoms of a serious illness. Palliative care specialists work with you, your family, and your other doctors to provide an additional layer of support to complement your ongoing care.
Risk factors in Thyroid cancer
Factors that can escalation your risk of thyroid cancer include:
• Female gender. Thyroid cancer happens more often in females than in men.
• Exposure to high levels of radiation. Radiation therapy treatments to the head and neck intensification the risk of thyroid cancer.
• Certain inherited genetic syndromes. Genetic syndromes that increase the risk of thyroid cancer contain familial medullary thyroid cancer, numerous endocrine neoplasia, Cowden syndrome, and familial adenomatous polyposis.
Complications in Thyroid cancer
Thyroid cancer that comes back
Despite treatment, thyroid cancer can return, even if your thyroid has been removed. This could happen if microscopic cancer cells spread beyond the thyroid before being removed.
Thyroid cancer can come back in:
• Lymph nodes in the neck
• Small pieces of thyroid tissue that remain during surgery
• Other areas of the body, such as the lungs and bones
Thyroid cancer that comes back can be treated. Your doctor may recommend regular blood tests or thyroid scans to check for signs of thyroid cancer recurrence.
Prevention in Thyroid cancer
Doctors aren't sure what causes most thyroid cancer, so there is no way to prevent thyroid cancer in people who are at average risk for the disease.
Prevention for people at high risk
Adults and kids with an inherited genetic transformation that increases the risk of medullary thyroid cancer may consider thyroid surgery to prevent cancer (prophylactic thyroidectomy). Discuss your options with a genetic counselor who can explain your risk for thyroid cancer and your treatment options.
Prevention for people close to nuclear power plants
Sometimes a drug that blocks the effects of radiation on the thyroid is given to people who live near nuclear power plants. The drug (potassium iodide) could be used in the unlikely event of a nuclear reactor accident. If you live within 10 miles of a nuclear power plant and are concerned about safety precautions, contact your local or state emergency management department for more information.
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