What is Acromegaly

TL;DR: Acromegaly is a rare hormonal disorder caused by the overproduction of growth hormone, usually originating from a benign pituitary tumor, which leads to the abnormal enlargement of bones, tissues, and internal organs. With 112 members currently sharing their experiences on DiseaseMaps.org, we recognize this condition requires specialized endocrine management to prevent long-term complications and improve quality of life.

What exactly is Acromegaly?

Acromegaly is a chronic condition characterized by the body producing too much growth hormone (GH) after the growth plates in the bones have closed. Because the bones can no longer grow in length, they instead increase in thickness and density. This systemic condition affects nearly every organ system, including the cardiovascular, respiratory, and metabolic systems. When this excessive hormone production occurs in childhood before growth plates close, the condition is known as gigantism; however, in adults, the diagnosis is defined as Acromegaly.

What causes Acromegaly and how does it develop?

The primary driver of Acromegaly is a benign (non-cancerous) tumor on the pituitary gland, known as a pituitary adenoma. This tumor secretes excessive amounts of growth hormone, which triggers the liver to produce an excess of insulin-like growth factor 1 (IGF-1). It is this high level of IGF-1 that causes the progressive physical changes and systemic health issues associated with the disease. While the exact cause of these tumor mutations is often sporadic, understanding the hormonal pathway is essential for effective treatment.

How common is Acromegaly and who is affected?

Acromegaly is considered a rare disease, with an estimated prevalence of approximately 40 to 70 cases per million people. The incidence rate is roughly 3 to 4 new cases per million people per year. The condition affects both men and women equally and is most frequently diagnosed in middle-aged adults, typically between the ages of 30 and 50. Because the physical changes associated with Acromegaly happen very slowly—often over several years—it is not uncommon for a patient to live with the condition for a decade before receiving an accurate diagnosis.

What are the primary clinical features of Acromegaly?

Because the excess growth hormone impacts soft tissues and bone density, patients often present with a distinct set of physical and systemic changes. Common clinical indicators include:

• Enlargement of the hands and feet (often requiring larger shoe and ring sizes).


• Coarsening of facial features, including a protruding jaw (prognathism) and enlarged nose.


• Excessive sweating (hyperhidrosis) and oily skin.


• Joint pain, mobility issues, and sleep apnea.


• Cardiovascular strain, including high blood pressure and an enlarged heart.


• Metabolic changes, such as insulin resistance or the development of type 2 diabetes.

How is Acromegaly differentiated from other conditions?

It is important to distinguish Acromegaly from normal aging or other endocrine disorders. Unlike conditions that cause generalized weight gain or swelling, Acromegaly is specifically identified by the overgrowth of acral parts (the extremities) and the presence of elevated IGF-1 levels in the blood. Diagnostic confirmation involves blood tests to measure GH and IGF-1 levels, followed by an oral glucose tolerance test, which is the gold standard for confirming that GH levels are not being suppressed as they should be in healthy individuals.

Next steps

• Consult an endocrinologist who specializes in pituitary disorders to discuss blood testing and imaging.


• Request a referral for an MRI of the pituitary gland if symptoms suggest a hormone-secreting tumor.


• Connect with the 112 members on DiseaseMaps.org to share experiences and learn from others living with this diagnosis.


• Keep a detailed log of your symptoms, including changes in shoe/glove size and sleep quality, to assist your clinical team.

Medical disclaimer: This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• Orphanet: Acromegaly (ORPHA:1584)


• NIH Genetic and Rare Diseases Information Center (GARD): Acromegaly


• The Pituitary Foundation: Understanding Acromegaly


• OMIM (Online Mendelian Inheritance in Man): Pituitary Adenoma, Growth Hormone-Secreting