Definition of superlative for English Language Learners. grammar : the form of an adjective or adverb that is used to indicate the greatest degree of a particular quality : the superlative form of an adjective or adverb.
The body's systems speed up and cause symptoms that are common to hyperthyroidism when thereâs a high level of thyroid hormone in the bloodstream. Symptoms include: 1  anxiety. 2  irritability. 3  fatigue. 4  hand tremors. 5  increased or irregular heartbeat.6  excessive sweating. 7  difficulty sleeping.8  diarrhea or frequent bowel movements.he body's systems speed up and cause symptoms that are common to hyperthyroidism when thereâs a high level of thyroid hormone in the bloodstream. Symptoms include: 1  anxiety. 2  irritability. 3  fatigue. 4  hand tremors. 5  increased or irregular heartbeat. 6  excessive sweating. 7  difficulty sleeping. 8  diarrhea or frequent bowel movements.
Abnormal function. When the thyroid gland produces too much thyroid hormone (becoming overactive), the condition is called hyperthyroidism. When the thyroid gland produces too little thyroid hormone (becoming underactive), the condition is called hypothyroidism.The most common cause of hyperthyroidism is an autoimmune condition called Graves' disease.bnormal function. When the thyroid gland produces too much thyroid hormone (becoming overactive), the condition is called hyperthyroidism. When the thyroid gland produces too little thyroid hormone (becoming underactive), the condition is called hypothyroidism.