Thyroid disorders are one of the most common endocrine problems in children and adolescents. Diagnostic considerations can be approached from the perspective of the goiter.A goiter, or thyromegaly, is an enlargement of the thyroid gland.Persons with enlarged thyroids can have normal function of the gland (euthyroidism), thyroid deficiency (hypothyroidism), or overproduction of the hormones (hyperthyroidism).