Multiple Endocrine Neoplasia (MEN) is a rare genetic disorder that affects the endocrine glands. The disorder is characterized by the development of tumors in multiple glands of the body. The most common types of MEN are MEN1, MEN2A, and MEN2B. While the term "Multiple Endocrine Neoplasia" is often used to describe this disorder, there are several other synonyms that are often used, including Multiple Endocrine Adenomatosis, Multiple Endocrinopathy Type 1, and Wermer Syndrome. In addition, the term "polyglandular syndrome" may be used to describe a group of disorders that includes MEN. Early diagnosis and treatment of this disorder is crucial to prevent complications, and individuals with a family history of MEN should undergo screening tests.