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Multiple endocrine neoplasia type 1 (MEN1) is an autosomal dominant disorder characterized by the occurrence of multiple tumors in the parathyroid gland, pancreatic islet, and pituitary gland. This condition is caused by mutations of MEN1, a tumor suppressor gene. Thus far, 565 different germline and somatic mutations of the MEN1 gene have been reported. Herein, we describe the case of a 23-year-old woman who suffered from a repetitive loss of consciousness. After workup, the patient was diagnosed with MEN1 with insulinoma, hyperparathyrodism due to parathyroid adenoma, and non-functioning pituitary microadenoma. She underwent a partial parathyroidectomy and distal pancreatectomy. Familial screening of MEN1 revealed that her brother had prolactinoma,hyperparathyroidism, pancreatic gastrinoma and non-functioning adrenal adenoma. Her father had hyperparathyroidism,pancreatic tumor, and adrenal adenoma. Upon genetic analysis of the MEN1 gene, a novel mutation in the MEN1 gene (exon 1,c.251del; p.Ser84LuefsX35) was detected in the patient, as well as her father and brother.