Fever is commonly associated with hyperthyroidism, or the hot type of the pediatric body. Hyperthyroidism is a common endocrine disorder caused by excessive secretion of thyroid hormones due to a variety of factors. Clinical manifestations of diagnostic significance are particularly noted in fear of heat, excessive sweating, agitation, hyperactivity with wasting, tachycardia at rest, specific eye signs, and enlarged thyroid gland. Thyroid hormones promote metabolism and redox reactions in the body. Hyper-metabolism requires the body to increase food intake; gastrointestinal activity is enhanced and an increase in stool occurs; although food intake increases, oxidative reactions are enhanced and the body consumes more energy, and patients show weight loss. The diagnosis of hyperthermia is often characterized by the main clinical manifestations of hyperthyroidism (hypermetabolic syndromes such as hyperphagia, lethargy, hyperthermia, hyperhidrosis, palpitations, agitation, increased neurological and vascular excitation, and varying degrees of goiter and proptosis). The incidence of hyperthyroidism in children has been on the rise in recent years. The onset of the disease is slow, with most cases being seen six months to a year after the onset of the disease. Typical cases include hypermetabolic syndrome, goiter, proptosis, neurological symptoms, cardiovascular symptoms, endocrine symptoms, digestive symptoms, hematologic and hematopoietic symptoms, reproductive symptoms, motor symptoms, skin and extremity symptoms.