Multiple Endocrine Neoplasia (MEN) disorders are inherited syndromes— this means they can be passed down in families. MEN disorders cause more than one gland of the endocrine (gland) system to develop neuroendocrine tumours, both benign (not cancer) and cancerous. The affected glands then over-produce hormones (the body’s chemical messengers), which in turn cause a variety of different symptoms. Each tumour may occur alone and independently of MEN. Early diagnosis and treatment are essential to help reduce the impact of these conditions on the patient.