What are euthyroid, hyperthyroid, and hypothyroid?
Normal thyroid hormone level in the blood is considered euthyroid. When the thyroid gland malfunctions, it can produce either too much hormone (hyperthyroid) or too little (hypothyroid). Either imbalance can cause a variety of symptoms. When abnormal hormone production is associated with an offending antibody, eye symptoms can develop (Graves disease).
