Children who suffer from thyroid disease get treated by a pediatric endocrinologist. Endocrinology is focused on the diagnosis and treatment of diseases related to hormones, including such human functions as the coordination of metabolism, respiration, reproduction, sensory perception, and movement. What is a pediatric endocrinologist? A pediatric endocrinologist is a doctor who specializes in the diagnosis and treatment of children with diseases of the endocrine system. This doctor will treat a child that has problems with growth, puberty, diabetes, ovarian and testicular dysfunction, obesity