Pituitary Adenomas (Prolactinomas, Non-functioning)
What is Pituitary Adenomas (Prolactinomas, Non-functioning)?
Pituitary adenomas are benign tumors that grow in the pituitary gland. The pituitary is a small gland at the base of your brain that controls many hormones. These tumors are not cancer, but they can still cause health problems.
There are two main types of pituitary adenomas. Functioning adenomas make extra hormones, like prolactinomas that produce too much prolactin. Non-functioning adenomas do not make hormones, but they can press on the gland and reduce normal hormone production. Both types can affect how your body regulates testosterone, thyroid hormones, cortisol, and growth hormones.
Most pituitary adenomas are small and grow slowly. Many people have them without knowing it. When these tumors grow larger or affect hormone levels, they can cause noticeable symptoms. Testing your hormone levels helps catch these changes early.
Symptoms
- Headaches, often at the front of the head
- Vision problems, especially losing peripheral vision
- Fatigue and low energy levels
- Low sex drive or sexual dysfunction
- Irregular or absent menstrual periods in women
- Erectile dysfunction in men
- Unexplained breast milk production
- Weight gain or difficulty losing weight
- Mood changes, including depression
- Muscle weakness and decreased muscle mass
Many people with small pituitary adenomas have no symptoms at all. These tumors are often found by accident during brain scans for other reasons. As tumors grow larger, symptoms become more noticeable.
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Causes and risk factors
The exact cause of pituitary adenomas is not fully understood. Most develop randomly without a clear trigger. A small number of cases run in families, linked to genetic conditions like multiple endocrine neoplasia type 1. Age plays a role, with most adenomas appearing in adults between 30 and 60 years old.
Risk factors include a family history of pituitary tumors or certain genetic syndromes. Gender matters too, as some types are more common in women. Prolactinomas affect women more often than men. Non-functioning adenomas occur equally across genders. Unlike other health conditions, lifestyle factors like diet and exercise do not appear to cause pituitary adenomas.
How it's diagnosed
Doctors diagnose pituitary adenomas using blood tests and brain imaging. Blood tests measure hormone levels to check if the pituitary is making too much or too little. Low testosterone in men or women can signal that a tumor is pressing on the gland. High prolactin levels suggest a prolactinoma. Your doctor will order an MRI or CT scan to see the tumor and measure its size.
Rite Aid's blood testing service measures testosterone levels, which can drop when pituitary adenomas affect hormone production. Getting tested twice a year helps you track changes before symptoms get worse. If your testosterone is low, your doctor can order imaging to check your pituitary gland. Early detection means easier treatment options.
Treatment options
- Medication to shrink prolactinomas, usually dopamine agonists like cabergoline or bromocriptine
- Testosterone replacement therapy for men with low testosterone caused by the tumor
- Estrogen or progesterone replacement for women with hormone deficiencies
- Surgery to remove the tumor if medication does not work or if it presses on nerves
- Radiation therapy for tumors that do not respond to medication or surgery
- Regular monitoring with blood tests and imaging to track tumor size and hormone levels
- Vision checks if the tumor is near the optic nerves
Treatment depends on tumor type, size, and symptoms. Many small, non-functioning adenomas just need monitoring. Prolactinomas often shrink with medication alone. Work with an endocrinologist who specializes in hormone disorders to find the right approach for you.
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Frequently asked questions
A prolactinoma makes too much prolactin, a hormone that controls breast milk production and reproductive function. Non-functioning adenomas do not produce extra hormones, but they can press on the pituitary gland and reduce normal hormone output. Both types can cause low testosterone, fatigue, and sexual problems. Prolactinomas usually respond well to medication, while non-functioning tumors may need surgery if they grow large.
Yes, pituitary adenomas can lead to weight gain through several pathways. When tumors reduce testosterone or thyroid hormone production, your metabolism slows down. Some functioning adenomas make excess cortisol, which promotes fat storage around the belly. Low energy from hormone imbalances also makes it harder to stay active. Treating the tumor and replacing missing hormones often helps with weight management.
Most doctors recommend hormone testing every 3 to 6 months when you first get diagnosed or start treatment. Once your levels are stable, testing every 6 to 12 months is usually enough. You will also need regular MRI scans, typically once a year, to check tumor size. Rite Aid's testing service lets you measure testosterone twice a year to catch changes early.
No, pituitary adenomas are benign tumors, which means they are not cancer. They do not spread to other parts of your body. That said, they can still cause serious health problems by pressing on nearby structures or changing hormone levels. Most grow very slowly and many never cause symptoms. Even benign tumors need monitoring and sometimes treatment.
Low testosterone has many possible causes beyond pituitary tumors. Aging, obesity, diabetes, certain medications, and testicular problems can all reduce testosterone. Sleep apnea and chronic stress also lower levels. If your testosterone is low, your doctor will check other hormone levels and may order brain imaging to rule out a pituitary cause. Most men with low testosterone do not have tumors.
Large pituitary adenomas can press on the optic nerves that sit just above the gland. This usually affects peripheral vision first, meaning you lose sight at the edges of your visual field. Some people describe it as looking through a tunnel. Double vision can occur if the tumor presses on nerves that control eye movement. These changes develop slowly and may be hard to notice at first.
Pituitary adenomas rarely disappear without treatment. Small, non-functioning tumors often stay the same size for years and never cause problems. Prolactinomas can shrink significantly with medication, and some stay small even after stopping treatment. Surgery or radiation can remove or destroy tumors, but regrowth is possible. Regular monitoring helps catch any changes.
Not everyone with a pituitary adenoma needs surgery. Prolactinomas usually shrink with medication alone. Small, non-functioning tumors that do not cause symptoms may just need watching. Surgery becomes necessary if the tumor presses on your optic nerves, causes severe hormone problems, or does not respond to medication. Most pituitary surgeries are done through the nose with minimal scarring.
Lifestyle changes cannot shrink pituitary adenomas, but they can help manage symptoms. Regular exercise and a balanced diet support hormone health and energy levels. Getting enough sleep helps your pituitary gland function better. Stress management may ease headaches and mood symptoms. If you need hormone replacement, healthy habits make the treatment work better and improve your quality of life.
Pituitary adenomas can reduce fertility by lowering sex hormones and disrupting ovulation or sperm production. Prolactinomas raise prolactin levels, which stops menstrual cycles in women and reduces sperm count in men. Non-functioning tumors can lower the hormones needed for reproduction. Treating the tumor with medication or surgery often restores fertility. Many people with pituitary adenomas can still have children with proper treatment.