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Multiple Endocrine Neoplasia (MEN) Syndromes

Multiple endocrine neoplasia (MEN) syndromes are inherited disorders that affect the endocrine system. The endocrine system is made up of glands and cells that make hormones and release them into the blood. MEN syndromes may cause hyperplasia (the growth of too many normal cells) or tumors that may be benign (not cancer) or malignant (cancer).

There are several types of MEN syndromes and each type may cause different conditions or cancers. The two main types of MEN syndromes are MEN1 and MEN2. MEN2 syndrome has two subgroups: MEN2A syndrome and MEN2B syndrome. MEN2A syndrome includes familial medullary thyroid cancer.

Learn more about MEN syndromes in children, including symptoms and how it is diagnosed and treated:

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