Health condition
Prolactinoma patient guide
A prolactinoma is a benign pituitary tumour that overproduces prolactin - the most common pituitary tumour, and one of the few tumours treated with tablets rather than surgery.
Key points
What matters most, at a glance.
The essentials in plain English - symptoms, when to seek help, who to see and what treatment looks like.
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In women: irregular or absent periods, milky nipple discharge, infertility; in men: low libido, erectile dysfunction, low energy
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Large tumours can press on the optic nerves, affecting peripheral vision
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Diagnosed with a prolactin blood test and pituitary MRI
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First-line treatment is a dopamine agonist tablet (cabergoline), which shrinks most tumours
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Managed by an endocrinologist; surgery is reserved for resistant cases
Understanding it
About Prolactinoma patient guide, and what to do next.
Prolactinomas are benign growths of the pituitary’s prolactin-producing cells. Excess prolactin suppresses the reproductive axis, so women present with missed periods, unexpected milk production or difficulty conceiving, while men - often diagnosed later - notice low libido, erectile problems and fatigue. Larger tumours (macroprolactinomas) can additionally cause headaches and tunnel-like vision loss by pressing on the optic chiasm.
Uniquely among pituitary tumours, medication is the mainstay: cabergoline normalises prolactin and shrinks the tumour in the great majority of patients, restoring periods and fertility. Most people start with their GP, who can refer to an endocrinologist. NHS routine referrals often take 20-45+ weeks depending on where you live, while a private consultation is typically available within about two weeks.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them.
Frequently asked
Common questions about Prolactinoma patient guide.
Quick, plain-English answers to what people ask us most.
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What is a prolactinoma?
A prolactinoma is a benign pituitary tumour that produces excess prolactin, a hormone normally involved in breast milk production, leading to a range of hormonal effects in both men and women.
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What causes a prolactinoma?
It develops from abnormal growth of prolactin-producing cells within the pituitary gland, generally arising sporadically without a clear identifiable cause.
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What are the symptoms?
In women, irregular or absent periods and unexpected breast milk production are common; in men, reduced libido and erectile dysfunction are typical, with headaches or visual changes possible if the tumour is larger.
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Is a prolactinoma dangerous?
Most prolactinomas are benign and grow slowly; the main risks relate to hormonal effects on fertility and bone health, and, for larger tumours, potential pressure on nearby structures like the optic nerves.
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Can a prolactinoma be cured?
Medication is highly effective at controlling prolactin levels and shrinking the tumour for most people, and in some well-managed cases treatment can eventually be reduced or stopped.
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How is a prolactinoma treated?
Medication (a dopamine agonist) is the standard first-line treatment for nearly all patients, with surgery reserved for the minority who don't respond well or experience significant side effects.
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How is a prolactinoma diagnosed?
A blood test measuring prolactin levels together with pituitary MRI imaging confirms the diagnosis, after ruling out other causes of elevated prolactin.
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How long does treatment take to work?
Most people see improving symptoms and normalising prolactin levels within a few months of starting treatment, with tumour shrinkage usually visible on follow-up imaging within around six months.
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Prolactinoma vs pregnancy-related prolactin changes — what's the difference?
Prolactin naturally rises during pregnancy and breastfeeding as part of normal physiology, whereas a prolactinoma causes persistently raised levels unrelated to pregnancy, confirmed through blood testing and pituitary imaging.
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When should I see a specialist, and how quickly can I be seen privately?
See an endocrinologist if you have symptoms of raised prolactin. Private specialist assessment is typically available within about two weeks, considerably faster than standard NHS referral pathways.