MEN3, or Multiple Endocrine Neoplasia type 3, is a rare genetic disorder that affects the endocrine system, which produces hormones. People with MEN3 often develop tumors in various glands, particularly the thyroid, parathyroid, and adrenal glands. These tumors can be benign or malignant and may lead to hormonal imbalances, causing various health issues. The condition is caused by mutations in the RET gene, which plays a crucial role in cell growth and development. Early diagnosis and management are essential for individuals with MEN3 to monitor and treat any tumors effectively, improving their quality of life and reducing complications.