What Causes Elevated Thyroid Levels?

COM SALUD Agencia de comunicación/CC-BY 2.0

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 hyperthyroidism as well. Taking too much thyroid medication can also cause the thyroid to overproduce hormones.

ADVERTISEMENT