Pituitary Adenoma (GH-secreting)
What is Pituitary Adenoma (GH-secreting)?
A GH-secreting pituitary adenoma is a benign tumor in the pituitary gland that makes too much growth hormone. The pituitary gland sits at the base of your brain and controls many hormones. When a tumor forms, it can produce excessive growth hormone even when your body does not need it.
Too much growth hormone causes a condition called acromegaly in adults. In children and teens who are still growing, it causes gigantism. The extra growth hormone tells your liver to make more insulin-like growth factor 1, or IGF-1. This protein drives many of the symptoms and health problems linked to the tumor.
Most GH-secreting adenomas grow slowly over years. Many people live with symptoms for a long time before getting diagnosed. Early detection through blood testing helps prevent serious complications like heart disease, diabetes, and joint damage.
Symptoms
- Enlarged hands, feet, or facial features that develop gradually
- Jaw protrusion and spacing between teeth
- Thickened, oily skin and skin tags
- Deepening voice due to enlarged vocal cords
- Joint pain and limited mobility
- Headaches and vision problems from tumor pressing on nearby structures
- Excessive sweating and body odor
- Fatigue and muscle weakness
- Snoring and sleep apnea
- Irregular menstrual periods in women
Symptoms develop very slowly, often over 5 to 10 years. Many people do not notice changes until family or friends point them out. Early symptoms are easy to miss or attribute to normal aging.
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Causes and risk factors
GH-secreting pituitary adenomas develop when cells in the pituitary gland begin to grow abnormally. Scientists do not fully understand why this happens. Most cases occur randomly with no clear genetic cause. A small percentage run in families as part of rare genetic syndromes like multiple endocrine neoplasia type 1 or familial acromegaly.
These tumors are not caused by lifestyle factors or environmental exposures. They are not contagious and cannot be prevented through diet or exercise. Risk does not increase with age in a predictable pattern. Both men and women can develop these tumors, usually between ages 30 and 50.
How it's diagnosed
Diagnosis starts with blood testing to measure IGF-1 levels. Elevated IGF-1 strongly suggests excess growth hormone production. Your doctor may also check growth hormone levels directly, often through a glucose suppression test. Normally, drinking a sugary drink lowers growth hormone. In people with GH-secreting adenomas, levels stay high.
Rite Aid offers IGF-1 testing as an add-on to our preventive health panel. Testing at Quest Diagnostics locations makes screening convenient and accessible. If blood tests show elevated IGF-1, your doctor will order brain imaging like an MRI to locate and measure the tumor.
Treatment options
- Surgery to remove the tumor through the nose, called transsphenoidal surgery, is often the first treatment
- Medications like somatostatin analogs to block growth hormone production when surgery is not possible or does not fully cure the condition
- Dopamine agonists like cabergoline that may shrink some tumors and reduce hormone levels
- Growth hormone receptor blockers like pegvisomant to prevent IGF-1 production
- Radiation therapy for tumors that do not respond to surgery or medications
- Regular monitoring with IGF-1 testing to check for tumor recurrence or persistence after treatment
- Managing complications like diabetes, high blood pressure, and sleep apnea
- Physical therapy for joint problems and mobility issues
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- Simple blood draw at your nearest lab
- Results in days, not weeks
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Frequently asked questions
Both conditions result from excess growth hormone from a pituitary adenoma. Gigantism occurs when the tumor develops before growth plates close, usually in children and teens, causing extreme height. Acromegaly happens in adults after growth plates have closed, leading to enlarged hands, feet, and facial features instead of increased height.
IGF-1 testing is highly sensitive for detecting excess growth hormone production. Levels remain elevated throughout the day, making IGF-1 more reliable than measuring growth hormone directly, which fluctuates hour to hour. Elevated IGF-1 prompts further testing to confirm the diagnosis and locate the tumor.
No, these tumors do not disappear without treatment. They typically grow slowly over many years and continue producing excess growth hormone. Without treatment, the tumor can cause permanent changes to bones and organs. Early intervention prevents irreversible complications.
Bone changes from long-term excess growth hormone are usually permanent. Soft tissue swelling may improve after successful treatment brings hormone levels down. The goal of treatment is to prevent further changes and reduce complications. Earlier treatment leads to better outcomes.
Most doctors recommend testing IGF-1 every 3 to 6 months after surgery or when starting new medications. Once levels stabilize in the normal range, testing may reduce to once or twice yearly. Regular monitoring helps detect tumor recurrence early when it is easier to treat.
Almost all pituitary adenomas are benign, meaning they are not cancer. They do not spread to other parts of the body. However, they can cause serious health problems by producing excess hormones and pressing on nearby brain structures. Treatment focuses on controlling hormone levels and tumor size.
Untreated GH-secreting adenomas lead to serious complications over time. Excess growth hormone increases risk of heart disease, diabetes, high blood pressure, colon polyps, and arthritis. The tumor can grow and press on the optic nerves, causing vision loss. Treatment significantly improves quality of life and reduces these risks.
Diet and lifestyle cannot reduce growth hormone production from a pituitary tumor. However, healthy habits help manage complications. Eating a balanced diet supports blood sugar control and heart health. Regular exercise maintains joint mobility and healthy weight. Medical treatment is necessary to address the root cause.
Many people achieve normal hormone levels after successful surgery and do not need long-term medication for growth hormone excess. However, some need medications if the tumor cannot be completely removed or recurs. Regular IGF-1 testing determines whether additional treatment is necessary. Your endocrinologist creates a personalized monitoring plan.
Pregnancy can cause pituitary adenomas to grow due to hormonal changes. Women with known tumors need close monitoring during pregnancy. Some medications used to treat these tumors are not safe during pregnancy. Discuss family planning with your endocrinologist to create a safe treatment plan before and during pregnancy.