Thyrotropin releasing hormone, also known as TRH, is a hormone that is released by the hypothalamus in the brain and stimulates the release of thyroid-stimulating hormone (TSH) by the pituitary gland. TRH is also responsible for regulating the production of other hormones in the body. There are several synonyms for TRH, including protirelin, thyroliberin, thyrotropin-releasing factor, and thyrotropic-releasing hormone. These terms are often used interchangeably in scientific research and medical literature to refer to the same hormone. Understanding the synonyms for TRH can be helpful for individuals interested in studying endocrinology or thyroid disorders.