Prolactinoma

Overview

A prolactinoma is a non-cancerous (benign) growth in the pituitary gland, a small gland at the base of the brain. This growth makes too much of a hormone called prolactin, which normally helps with breastfeeding and reproductive health. Too much prolactin can cause problems with periods, fertility, and sex drive.

Prolactinomas are not extremely common, but they are the most frequent type of pituitary tumor. They affect about 1 in 10,000 people.

They are more common in women than in men, especially during childbearing years. But they can occur at any age, including in children and older adults.

Symptoms

Common symptoms

• Women: irregular or missed periods, leaking milk from the breasts (galactorrhea) even if not breastfeeding, infertility, low sex drive.
• Men: low sex drive, erectile dysfunction, enlarged breast tissue (gynecomastia), infertility.
• Both: headaches, vision problems (especially loss of side vision), low bone density.

Symptoms in children

• Delayed or early puberty
• Slow growth
• Headaches and vision changes

Symptoms in older adults

• Symptoms may be less obvious and often mistaken for aging
• Low sex drive, fatigue, vision changes

Causes

Main causes

• The exact cause is not known. In most cases, a single cell in the pituitary gland mutates and starts multiplying, forming a small growth that makes too much prolactin.

Risk factors

• Being female (especially ages 20–50)
• Having a family history of certain genetic conditions like multiple endocrine neoplasia type 1 (MEN1).

When to see a doctor

See a doctor urgently if:

• If you have sudden severe headache or vision loss – call emergency services immediately.
• If you have new double vision or trouble seeing to the side.

Book a routine appointment if:

• If you have irregular periods, unexpected milk leakage from breasts, trouble getting pregnant, or low sex drive.
• If you have headaches that do not go away.

Diagnosis

Your doctor will start by asking about your symptoms and doing a physical exam. They will also order blood tests to check your prolactin levels and may refer you to a hormone specialist (endocrinologist).

Tests that may be done

• Blood test to measure prolactin level (a high level may indicate a prolactinoma)
• Imaging test like an MRI scan of the pituitary gland to look for a growth
• Blood tests to check other pituitary hormones

What to expect at your appointment

The diagnosis is usually straightforward. You may need to have blood drawn in the morning or after a fast. The MRI is painless, though you'll need to lie still inside a machine. Most people do not need a biopsy because the blood test and MRI are enough.

Treatment

Treatment depends on the size of the growth, your symptoms, and your plans for pregnancy. The goal is to bring prolactin back to normal, shrink the growth, and relieve symptoms. Most people are treated with medication, not surgery.

Self-care at home

• Take medications exactly as prescribed – do not stop without talking to your doctor.
• Keep all follow-up appointments so your doctor can check hormone levels and the size of the growth.
• If you have vision changes, let your doctor know right away.

Medical treatments

The main treatment is a type of medication called dopamine agonists. These medicines lower prolactin levels and can shrink the tumor. They are usually taken as pills. Your doctor will adjust the dose based on your response. Regular blood tests and occasional MRI scans are needed to monitor progress.

When is surgery considered?

Surgery to remove the tumor is considered if medications do not work, you cannot tolerate them, or the tumor is very large and pressing on your vision. Surgery is done through the nose (transsphenoidal surgery) by a specialist.

Living with this condition

With treatment, many people feel back to normal. You may need to take medication for a few years or longer. Regular check-ups with your endocrinologist are important.

Lifestyle tips

• Take your medications as directed and do not skip doses.
• Talk to your doctor before taking any new medicines, including over-the-counter or herbal remedies.
• Wear a medical alert bracelet or carry a card that says you have a pituitary condition.

Diet and exercise

Eat a balanced diet rich in calcium and vitamin D to protect your bones, since high prolactin can weaken them. Moderate exercise, such as walking or swimming, is encouraged. Stay hydrated and avoid extreme diets without consulting your doctor.

Mental health and emotional wellbeing

Living with a prolactinoma can be stressful – it can affect your mood, body image, and relationships. It is normal to feel worried about fertility, sex drive, or the need for long-term treatment. Talk to your doctor if you feel anxious or depressed; they can recommend counseling or support groups.

Prevention

Most prolactinomas cannot be prevented because the cause is unknown. There are no known lifestyle changes that lower the risk.

Screening programmes

Routine screening for the general population is not recommended. If you have a family history of MEN1, your doctor may suggest genetic counseling and periodic tests.

Complications

If left untreated

• Infertility and menstrual problems may continue or get worse.
• Loss of bone density (osteoporosis) due to high prolactin.
• If the tumor grows large, it can press on the optic nerves and cause permanent vision loss.
• Very rarely, the tumor can bleed or cause a sudden medical emergency.

Long-term outlook

With today's treatments, the outlook is excellent. Most prolactinomas shrink and symptoms improve. Many people can stop medication eventually. Even if the tumor comes back, it can often be treated again. Most people live full, active lives.

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