The school nurse notices that a 14-year old who used to be an excellent student and very active in sports is losing weight, acting very nervous and wide bulging eyes. The teen was recently checked by the primary care provider (PCP), who noted the teen had a very low level of TSH. The nurse recognizes that the teen has which condition?

A. Hypothyroidism: Hypothyroidism is characterized by symptoms such as weight gain, fatigue, dry skin, and cold intolerance. The teen's symptoms of weight loss, nervousness, and bulging eyes are not typical of hypothyroidism. B. Juvenile autoimmune thyroiditis: Juvenile autoimmune thyroiditis is typically associated with hypothyroidism and does not present with symptoms like weight loss, nervousness, or bulging eyes. It is more often characterized by fatigue, cold intolerance, and weight gain. C. Hashimoto thyroid disease: Hashimoto's disease is an autoimmune disorder that often leads to hypothyroidism. The symptoms described (weight loss, nervousness, bulging eyes) do not align with Hashimoto's disease, which is generally linked to an underactive thyroid. D. Graves' Disease: Graves' disease is a type of hyperthyroidism often characterized by weight loss, nervousness, bulging eyes (exophthalmos). The symptoms align with the presentation of this teen, and the low TSH level further supports the diagnosis.