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Located in the front of your lower neck, the thyroid is the largest endocrine gland in the human body. It is responsible for how the body uses energy by producing proteins and determining how sensitive the body is to hormones. Thyroid cancer is a cancer that starts in the thyroid gland but can spread to other parts of the body. Symptoms of thyroid cancer can include neck swelling, persistent cough, swelling in the neck, enlargement of the thyroid gland, and problems swallowing. There are four types of thyroid cancer: papillary, anaplastic, medullary, and follicular.

The most common type of thyroid cancer is papillary carcinoma and usually affects women under 45. It is the least dangerous type of cancer as it spreads more slowly, which enables earlier detection. Most people with this type of thyroid cancer are cured and can expect to have a normal life span. The rarest form, anaplastic carcinoma, also is the most dangerous type of thyroid cancer. It spreads rapidly, usually ruling out a quick surgical removal, and does not respond well to radiation therapy. No matter how aggressive the treatment, this type of thyroid cancer is usually deadly. Medullary carcinoma has a genetic basis, as it tends to appear among families. This cancer occurs in those non-thyroid cells generally present in the thyroid. The treatment outcomes vary greatly, with younger women tending to experience better outcomes than most patients. Accounting for a tenth of all thyroid cancers, follicular carcinomas often are fast growing but highly treatable. Most patients with this type of thyroid cancer can expect to be fully cured.

The most common form of treatment is surgery, with the entire gland being removed. It is very common for lymph nodes to be removed at this time as well. Radiation therapy often is used, either through x-ray radiation or ingesting radioactive iodine. Chemotherapy can be used if the cancer has spread to other parts of the body, but this is rarely effective for any but a small number of patients.

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