Neonatal Thyrotoxicosis

**Semantic type:** Disease or Syndrome

**Definition:** A hypermetabolic syndrome characterized by tachycardia, palpitations, tremor, weight loss, and moist skin that is caused by the elevation of thyroid hormone levels in the serum of the newborn infant or thyroid-axis receptor activation, most commonly due to transplacental passage of thyroid stimulating globulins.

**Synonyms:** - Infantile Hyperthyroidism