The most common cause of elevated thyroid levels, referred to as overactive thyroid or hyperthyroidism, is Grave's disease, notes WebMD. Other conditions, such a thyroid nodule, thyroiditis and excess iodine, can cause h... More »

Slightly elevated thyroid levels may be caused by a condition called hyperthyroidism. Hyperthyroidism, also referred to as an overactive thyroid or overactive thyroid disease, occurs when the thyroid gland produces more ... More »

A positive thyroid peroxidase antibody test indicates that a person's thyroid disease is likely caused by an autoimmune disorder, explains The Mayo Clinic. Some autoimmune disorders cause the immune system to produce ant... More »

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Slightly elevated thyroid levels may be caused by a condition called hyperthyroidism. Hyperthyroidism, also referred to as an overactive thyroid or overactive thyroid disease, occurs when the thyroid gland produces more ... 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 »

Symptoms of low thyroid-stimulating hormone, or TSH, levels due to hyperthyroidism include rapid heartbeat, sudden weight loss, nervousness, tremors and increased appetite, notes Mayo Clinic. Some symptoms of low TSH lev... More »

An overactive thyroid produces more thyroid hormones than the body needs, and the medical term for the condition is hyperthyroidism, according to WebMD. Women have a higher risk of developing the condition than men. More »

www.reference.com Health Conditions & Diseases