Multiple Endocrine Neoplasia Symptoms

Symptoms of multiple endocrine neoplasia (MEN) can vary depending on the type and which endocrine glands are affected. Some people may experience symptoms early in life, while others may not notice signs until adulthood. In some cases, tumors may be found during screening before symptoms even appear.

Multiple endocrine neoplasia type 1 symptoms

MEN1 most commonly affects the parathyroid, pancreas and pituitary glands. Common symptoms include:

• Hyperparathyroidism: Overproduction of parathyroid hormone, which can lead to tiredness, weakness, bone or muscle pain, constipation, kidney stones and thinning bones (osteopenia or osteoporosis). Many people with MEN1 develop this by age 50, often as the first symptom.
• Digestive problems: Caused by high levels of gastrin (a hormone that stimulates the stomach to produce gastric acid) from tumors in the pancreas or duodenum, leading to ulcers, esophagus inflammation, abdominal pain and diarrhea.
• Pituitary tumors: Can lead to:
  • Headaches and vision changes
  • Milk production from the breasts due to prolactin overproduction
  • Hormone imbalances affecting sexual function and fertility
  • Acromegaly due to growth hormone overproduction
  • Cushing syndrome due to cortisol overproduction

Multiple endocrine neoplasia type 2 symptoms

MEN2B typically causes more noticeable physical features and symptoms in childhood or early adulthood. These may include:

• Neuromas: Small growths on the lips, tongue and inside the mouth
• Thickened eyelids and lips
• Unusual bone development: These include abnormalities in the feet or thighs, spinal curvature and loose joints
• Tall, slender body type
• Digestive issues: Including enlargement and irritation of the large intestine (often leading to constipation or discomfort)
• Medullary thyroid cancer: Often the first and most serious symptom, even before others appear

MEN2A, in contrast, usually does not have the physical features seen in MEN2B. Symptoms generally appear later, often in adulthood, and may include:

• Medullary thyroid cancer: The main symptom, often the first to appear
• Pheochromocytomas: Tumors of the adrenal glands, which can cause high blood pressure, headaches, sweating or palpitations
• Hyperparathyroidism: Overactive parathyroid glands, which can cause high calcium levels, kidney stones, bone pain or fatigue

What does multiple endocrine neoplasia feel like?

Because MEN affects hormone-producing glands, symptoms are often related to changes in hormone levels. These changes may cause:

• Ongoing fatigue and muscle weakness
• Digestive issues like nausea, ulcers or diarrhea
• Severe constipation in a young child
• Changes in vision or frequent headaches
• Sexual and fertility problems
• Bone pain or fractures
• Mood swings or anxiety
• Unusual growths under the skin or on the face, lips or tongue

Symptoms can develop gradually or be triggered by stress or other health conditions. Many people report feeling unusual or experiencing a combination of symptoms that don’t seem related at first.

Other conditions with similar symptoms

Many symptoms of MEN can overlap with those of other health conditions. These include:

• Thyroid disorders, such as Graves’ disease or hypothyroidism, which can cause hormone imbalances similar to those seen in MEN.
• Cushing syndrome, which can result from long-term steroid use or other non-MEN causes, and may present with weight gain, fatigue or skin changes.
• Pituitary adenomas that occur independently of MEN can produce hormones leading to symptoms similar to MEN-related pituitary tumors.
• Parathyroid disease not related to MEN can cause high calcium levels and related complications.
• Neuroendocrine tumors can develop independently of MEN1 or MEN2, sometimes producing similar hormonal effects.
• Genetic syndromes, such as neurofibromatosis or Marfan syndrome, may cause some physical traits that overlap with features of MEN.

If you’re experiencing symptoms or have a family history of endocrine conditions, talk to your doctor or a genetic counselor about whether MEN testing is right for you.

When to see a doctor

You should see a doctor if you experience:

• A family history of MEN or endocrine tumors
• Unexplained tiredness, headaches or digestive issues
• Changes in vision, growth or physical appearance
• Kidney stones or bone pain
• Sudden changes in sexual function, mood or metabolism

Early diagnosis can help prevent serious complications. Genetic testing and regular checkups are especially important if you have a family history of MEN.