Endotext.org is the web-based source of information on endocrine disease directed to physicians around the world caring for patients with these problems. It is comprehensive, authoritative, constantly up-dated, un-biased, and available without cost to physicians and trainees. All material may be freely downloaded for personal use. This site covers the broad area of Clinical Endocrinology, emphasizing clinical endocrine practice, including the most current information on the manifestations of endocrine disease, diagnosis and treatment. Endotext.org is the premier provider of well reviewed and organized clinical endocrine information on the Web. Endotext.org is solely responsible for all content. Our site is made available through the fantastic generosity of the authors and editors who have provided their articles as a service to the profession. We are supported in part by Educational Grants, and non-intrusive ads with hyperlinks to company sites providing product information.