Multiple Endocrine Neoplasia Type 1: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Multiple Endocrine Neoplasia Type 1?
An endocrinologist, a doctor who specializes in hormones, usually leads care for MEN1. Surgeons may remove growths when needed. A direct primary care or concierge doctor can coordinate your overall care, but because MEN1 is complex, they typically refer you to an endocrinologist for diagnosis and treatment planning.
What it is
Multiple Endocrine Neoplasia Type 1, often called MEN1, is a rare condition people are born with. It causes tumors to form in glands, the organs that make hormones. In MEN1, the growths usually appear in the parathyroid glands in the neck, the pituitary gland at the base of the brain, and the pancreas. Most growths are not cancer, but they can make too much hormone and cause health problems.
Symptoms
Symptoms vary from person to person, and some people have none for years. Common signs include tiredness, stomach pain or ulcers, kidney stones, headaches, and problems with vision. High calcium can cause thirst, frequent urination, and confusion. Pituitary involvement may cause headaches or vision problems.
Causes and who gets it
MEN1 is caused by a mutation in a gene named MEN1 that normally keeps cell growth under control; when it fails, cells can grow too much and form tumors. A parent with MEN1 can pass the changed gene to a child, who has a one in two chance of inheriting it. Sometimes the change appears for the first time in someone with no family history. It affects men and women equally and occurs in about one in 30,000 people.
How doctors diagnose it
Doctors start with a family history and physical exam. Blood tests measure hormone levels and calcium, and imaging such as an MRI can show growths. Genetic testing can confirm the diagnosis, and family members may also be offered testing so problems can be caught early.
Treatment
Treatment depends on which glands are affected. Overactive parathyroid glands are often treated with surgery. Medicines can block excess stomach acid or control hormone levels from the pancreas. Pituitary growths may be treated with medicines, surgery, or sometimes radiation. People with MEN1 need regular checkups for life, since new growths can appear, and plans are tailored to each patient.
When to see a doctor
Anyone with a parent, sibling, or child who has MEN1 should ask a doctor about testing, even without symptoms. See a doctor for repeated kidney stones, recurring stomach ulcers, unexplained tiredness, or high calcium on a blood test. Early checks make a real difference.
Common questions
Is MEN1 a form of cancer?
Most growths in MEN1 are not cancer. However, some pancreatic growths can become cancerous. This is why regular monitoring matters so much for people with this condition.
Can MEN1 be cured?
There is no cure for the gene change itself. Doctors can usually treat the problems it causes. Many people with MEN1 live full lives with proper monitoring.
Should my children be tested?
Children and siblings of someone with MEN1 have a chance of carrying the same gene change. A genetic counselor or doctor can explain testing options and help families decide what is right for them.
How often will I need checkups?
Most people with MEN1 see their care team at least once a year for blood and imaging tests. Your doctor will set a schedule based on which glands are affected.
Sources
- NIH Genetic and Rare Diseases Information Center - Multiple endocrine neoplasia, type 1
- MedlinePlus - Multiple endocrine neoplasia (MEN) II
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
