Prolactinoma
What is Prolactinoma?
Prolactinoma is a noncancerous tumor that grows in your pituitary gland. The pituitary is a small gland at the base of your brain that controls many hormones in your body. When you have a prolactinoma, this tumor produces too much of a hormone called prolactin.
Prolactin normally helps women produce breast milk after childbirth. It also plays a role in reproductive health for both men and women. When prolactin levels get too high, it can disrupt your menstrual cycle, fertility, and sexual function. Most prolactinomas are small and grow slowly. They rarely cause serious health problems beyond hormone imbalances.
Prolactinoma is the most common type of pituitary tumor. It affects women more often than men, especially women between ages 20 and 50. The good news is that most prolactinomas respond well to treatment. Many people see their symptoms improve once prolactin levels return to normal ranges.
Symptoms
- Irregular or absent menstrual periods in women
- Milky discharge from breasts in women who are not pregnant or nursing
- Difficulty getting pregnant or infertility
- Low sex drive in both men and women
- Erectile dysfunction in men
- Decreased facial and body hair in men
- Headaches, often behind the eyes
- Vision problems or loss of peripheral vision
- Unexplained weight gain
- Fatigue and low energy
Some people with small prolactinomas have no symptoms at all. Symptoms may develop slowly over months or years. Larger tumors are more likely to cause headaches and vision changes because they press on nearby structures in the brain.
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Causes and risk factors
Prolactinomas develop when cells in the pituitary gland start to grow abnormally and form a tumor. Doctors do not know exactly why this happens. These tumors are not caused by anything you did or did not do. They are not contagious and do not run strongly in families, though rare genetic conditions can increase risk.
Certain medications can raise prolactin levels and mimic prolactinoma symptoms. These include some antipsychotics, antidepressants, and blood pressure medications. Other conditions like hypothyroidism, kidney disease, and chest wall irritation can also elevate prolactin. Your doctor will rule out these causes before diagnosing a prolactinoma. Women of reproductive age and people taking certain medications face higher risk of developing elevated prolactin levels.
How it's diagnosed
Doctors diagnose prolactinoma by measuring prolactin levels in your blood. A prolactin test requires a simple blood draw, usually done in the morning when levels are most stable. High prolactin levels suggest a prolactinoma, especially if levels are very elevated. Rite Aid offers prolactin testing as part of our preventive health panel, making it easy to check your levels at a Quest Diagnostics location near you.
If your prolactin test shows high levels, your doctor will likely order an MRI scan of your pituitary gland. This imaging test can show the size and location of the tumor. Your doctor may also test other pituitary hormones to make sure the tumor is not affecting other gland functions. Getting tested early helps catch prolactinomas when they are small and easier to treat.
Treatment options
- Medication with dopamine agonists like cabergoline or bromocriptine to lower prolactin levels and shrink the tumor
- Regular monitoring of prolactin levels through blood tests to track treatment progress
- Stress management and adequate sleep to support overall hormone balance
- Avoiding medications that raise prolactin levels when possible
- Surgery to remove the tumor if medications do not work or cause severe side effects
- Radiation therapy in rare cases when surgery and medication are not effective
- Nutritional support including foods rich in vitamin B6, zinc, and magnesium
- Regular follow-up with an endocrinologist to adjust treatment as needed
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- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
The first signs often include menstrual changes in women, such as irregular or missed periods. Women may also notice milky breast discharge when not pregnant or nursing. Men typically first notice low sex drive or erectile dysfunction. Some people experience headaches or vision changes if the tumor is larger.
Most prolactinomas do not go away without treatment. Small tumors may stay the same size for years without growing. However, they continue producing high prolactin levels that cause symptoms. Medication can shrink the tumor and restore normal prolactin levels in most cases.
High prolactin can have many causes, including medications, stress, hypothyroidism, or kidney problems. A prolactinoma is a specific cause of high prolactin. It is a benign tumor in the pituitary gland that produces excess prolactin. Your doctor uses blood tests and imaging to determine the exact cause of elevated prolactin.
Normal prolactin levels are usually below 25 nanograms per milliliter. Levels above 200 strongly suggest a prolactinoma. Levels between 25 and 200 may indicate a small tumor or another cause of high prolactin. Very high levels above 250 almost always mean a prolactinoma is present.
Yes, many women with prolactinoma can get pregnant after treatment. Medication that lowers prolactin usually restores normal ovulation and menstrual cycles. Most women become fertile again within a few months of starting treatment. Your doctor will monitor you closely during pregnancy to adjust medications as needed.
Most people do not need surgery for prolactinoma. Medication effectively controls the condition in about 80 to 90 percent of cases. Surgery may be needed if medications do not work, cause serious side effects, or if the tumor is very large. Your endocrinologist will help you decide the best treatment approach.
Testing frequency depends on your treatment stage. When starting medication, you may test every 4 to 6 weeks until levels normalize. Once stable, testing every 6 to 12 months is common. Your doctor will create a testing schedule based on your symptoms and treatment response.
No specific foods lower prolactin levels significantly. However, eating foods rich in vitamin B6, zinc, and magnesium may support healthy hormone balance. These include leafy greens, nuts, seeds, whole grains, and lean proteins. Managing stress and getting enough sleep also help maintain healthy prolactin levels.
Stress does not cause prolactinomas to develop. However, stress can temporarily raise prolactin levels in healthy people. This can make diagnosis more challenging. Chronic stress may worsen symptoms in people who already have a prolactinoma by affecting overall hormone balance.
Prolactinomas are almost always benign and not life-threatening. They grow slowly and rarely become cancerous. The main concerns are hormone imbalance symptoms and possible vision problems if the tumor grows large. With proper treatment, most people live normal, healthy lives and see their symptoms resolve.