Possible causes of an underactive thyroid include autoimmune diseases, treatment for hyperthyroidism, thyroid surgery, radiation therapy and medications, according to Mayo Clinic. Less common causes of hypothyroidism inc... More »

www.reference.com Health Conditions & Diseases

Supplement your iodine intake by using regular iodized table salt in your foods or taking iodine supplement tablets, recommends the American Thyroid Association. Some multivitamins also contain iodine. Foods that are ric... More »

www.reference.com Health Conditions & Diseases

Halogens can be considered toxic; however, some are regarded as essential for a number of bodily functions and are used in a variety of everyday products, according to Boundless. Fluoride, for example, is a halogen compo... More »

www.reference.com Vehicles Car Parts & Maintenance

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 »

Some causes of low thyroid levels include the autoimmune disorder Hashimoto's thyroiditis, certain medications, radioactive iodine treatment, lack of iodine in the diet, thyroid surgery, and postpartum thyroiditis, notes... More »

www.reference.com Health Conditions & Diseases

Symptoms of an underactive thyroid, or hypothyroidism, include unexpected weight gain, dry skin, constipation, higher cold sensitivity, changes in the menstrual cycle and fatigue, according to Mayo Clinic. People with hy... 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 »