Balice G. Theintz Rev Med Suisse ; volume 3. Bibliographie 1 Delange F. Bull WHO ; N Engl J Med ; Monitoring the adequacy of salt iodization in Switzerland : A national study of school children and pregnant women.

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Thyroid nodules in the thyroid gland. What are thyroid nodules? A thyroid nodule is an unusual growth lump of thyroid cells in the thyroid gland. The thyroid is part of the endocrine system, which is made up of glands that secrete various hormones into the bloodstream.

Thyroid hormones control functions such as body temperature, digestion and heart functions. What causes a thyroid nodule to form? Sometimes the thyroid begins to grow overgrowth , causing one or more nodules to form. Why this happens is not known. Cancer is the biggest concern when nodules form. Fortunately, cancer is very rare — it is found in less than 5 percent of all nodules.

Iodine is needed to make thyroid hormone. There are different types of thyroid nodules: Colloid nodules: These are one or more overgrowths of normal thyroid tissue. These growths are benign not cancer.

They may grow large, but they do not spread beyond the thyroid gland. Thyroid cysts: These are growths that are filled with fluid or partly solid and partly filled with fluid. Inflammatory nodules: These nodules develop as a result of chronic long-term inflammation swelling of the thyroid gland. These growths may or may not cause pain. Multinodular goiter: Sometimes an enlarged thyroid goiter is made up of many nodules which are usually benign.

Hyperfunctioning thyroid nodules: These nodules autonomously produce thyroid hormone without regard for normal feedback control mechanisms, which may lead to the development of hyperthyroidism. Hyperthyroidism can affect the heart and cause such problems as sudden cardiac arrest, high blood pressure, arrhythmias abnormal heart rhythm , osteoporosis and other health problems.

Thyroid cancer: Less than 5 percent of thyroid nodules are cancerous. How do I know if I have thyroid nodules? Most thyroid nodules do not produce any symptoms. However, if you have several nodules, or large nodules, you may be able to see them. Although rare, nodules can press against other structures in the neck and cause symptoms, including: Trouble with swallowing or breathing Hoarseness or voice change Pain in the neck Goiter enlargement of the thyroid gland Hyperfunctioning thyroid nodules can lead to overproduction of thyroid hormones, also known as h yperthyroidism.

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