E05: Thyrotoxicosis [hyperthyroidism]

E05.9: Thyrotoxicosis, unspecified

The thyroid is a small organ at the bottom of the neck. The thyroid gland needs iodine to produce important messenger substances for the body. These messenger substances influence the heartbeat, digestion, and body temperature, among other things.

Having too many thyroid messenger substances can cause a range of problems. For example, you may be restless or have a rapid heartbeat. You may also break out in a sweat often and lose weight.