High thyroid levels, or hyperthyroidism, is most commonly caused by Graves’ disease, but can also be caused by multinodular or toxic nodular goiters, excess consumption of iodine or medications that contain iodine, accor... More »

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There are several possible causes for high thyroid levels, including Graves' disease, toxic adenoma, Plummer's disease and thyroiditis, according to Mayo Clinic. The general term used when a patient has an overactive thy... More »

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Causes of high levels of thyroid-stimulating hormone include hypothyroidism, a tumor in the pituitary gland, or a need to increase the amount of thyroid hormone medicine, according to WebMD. The pituitary gland produces ... More »

Possible causes of an overactive thyroid, or hyperthyroidism, include Graves' disease, thyroiditis, a thyroid nodule or too much iodine levels in the body, according to WebMD. Taking excessive thyroid hormone medications... More »

Causes of low thyroid and dizziness include autoimmune diseases, pregnancy, certain medications, insufficient iodine levels and thyroid destruction during surgical removal of tumors of the thyroid gland, according to May... More »

High levels of thyroid indicate hyperthyroidism, a condition whereby the thyroid gland produces too much thyroid hormone, according to WebMD. The most common cause of this is Grave's disease, which tends to be hereditary... More »

Medical thyroid problems have many causes, the primary ones being Graves’ disease, Subacute thyroiditis, removal of the thyroid gland, autoimmune disorders and too much iodine. These causes result in the production of an... More »

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