The endocrine system simply refers to the glands and organs that make hormones and release them directly into the blood so they can travel to tissues and organs all over the body. The hormones released by the endocrine system control many important functions in the body, including growth and development, metabolism, and reproduction. It is recommended that people with TS work with an endocrinologist (doctors specializing in the endocrine system) to assess how their body's endocrine system is affected by TS. Once treatment is established, a doctor other than an endocrinologist may manage treatments if an endocrinologist is not available.