SLOT: Full Definition
What is acromegaly?
Acromegaly — also called growth hormone excess — is a rare endocrine disorder caused by chronically elevated levels of growth hormone (GH) and its downstream messenger, insulin-like growth factor 1 (IGF-1). When GH excess begins in adulthood, after the growth plates have closed, the body cannot grow taller, but bone and soft tissue continue to thicken. The result is a slow, often subtle enlargement of the hands, feet, jaw, and facial features over many years.
Women may notice rings becoming tight, shoes no longer fitting, deeper voice, increased spacing between teeth, jaw protrusion, oily skin, snoring or sleep apnea, joint pain, and changes in facial appearance visible only when comparing old photos. Because it develops so gradually, acromegaly is often diagnosed years after symptoms began.
What causes acromegaly?
The overwhelming majority of cases — over 95% — are caused by a benign growth hormone-secreting Pituitary Adenoma. Very rarely, GH excess comes from a tumor elsewhere in the body that produces growth hormone-releasing hormone (GHRH). When GH excess begins before puberty, the resulting condition is called gigantism rather than acromegaly.
Acromegaly affects men and women roughly equally and is typically diagnosed between ages 30 and 50.
How is acromegaly diagnosed?
Diagnosis starts with two blood tests: an IGF-1 level (elevated for age and sex) and an oral glucose tolerance test with GH measurement. Normally, glucose suppresses GH; in acromegaly, it does not. Once biochemical excess is confirmed, an MRI of the pituitary is performed to identify the tumor. Additional workup includes other pituitary hormones (TSH, Free T4, prolactin, ACTH/cortisol, LH/FSH), since larger tumors can disrupt the rest of pituitary function and lead to Hypopituitarism. Visual field testing is added when the tumor is large.
MTC is not the typical first stop for acromegaly, but the condition occasionally surfaces during a thorough hormonal evaluation, particularly when patients describe long-standing changes in shoe and ring size alongside metabolic symptoms.
How is acromegaly treated?
Treatment is led by endocrinology and neurosurgery. Transsphenoidal surgery to remove the pituitary tumor is first-line for most patients and is curative in many cases. When surgery doesn't fully normalize GH and IGF-1, medications such as somatostatin analogs (octreotide, lanreotide), GH-receptor antagonists (pegvisomant), or dopamine agonists may be added. Radiation therapy is reserved for tumors that don't respond to surgery or medication.
Untreated acromegaly raises the long-term risk of cardiovascular disease, Type 2 Diabetes, sleep apnea, joint disease, and certain cancers, which is why early recognition matters. Modern Thyroid Clinic does not manage acromegaly directly but coordinates supportive endocrine care and metabolic optimization for women living with the diagnosis.
Common symptoms
Common questions
How is acromegaly different from just having larger features?
Acromegaly is a progressive change driven by hormonal excess, not a stable feature you've always had. The diagnostic clue is change over time — rings or shoes that no longer fit, jaw and facial features thickening, voice deepening, and metabolic symptoms developing in parallel. Old photographs are surprisingly useful: a side-by-side comparison over a decade often reveals the slow soft-tissue and bony changes that are otherwise easy to miss.
Can acromegaly cause diabetes or thyroid problems?
Yes. Excess growth hormone counteracts insulin, so insulin resistance and [type-2-diabetes] are common. Many patients also develop sleep apnea, hypertension, and joint disease. If the pituitary tumor is large, it can compress and impair the rest of the gland, lowering thyroid, cortisol, or sex-hormone signaling and producing [hypopituitarism]. A full pituitary panel is part of any acromegaly workup.
Is acromegaly curable?
Many cases — especially smaller, surgically accessible tumors — can be cured by an experienced pituitary neurosurgeon. When surgery doesn't fully normalize hormones, medications can usually bring GH and IGF-1 into a healthy range. With proper treatment, most patients regain near-normal life expectancy. Long-term follow-up with endocrinology is essential to monitor for tumor recurrence and manage downstream metabolic and cardiovascular risk.
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Book a Discovery CallThis content is for educational purposes only and is not medical advice. Consult a licensed clinician for diagnosis and treatment. Content on this page does not create a doctor-patient relationship with Modern Thyroid Clinic.