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What is hyperprolactinaemia?

Your Health / Conditions / Hormones / What is hyperprolactinaemia?

Published on Mar 11, 2022
Authored by Kate Porz, BPharm


Hyperprolactinaemia can have some uncomfortable symptoms, including milky discharge from your breasts, in either men or women, or it may be impacting your chance of having a baby.

In this article you’ll find out what hyperprolactinaemia is, the symptoms, possible causes and how your doctor will diagnose this condition. In most instances this condition is not life-threatening and can be treated, with people’s symptoms going away within a few weeks of therapy.

What is prolactin?

Prolactin is a hormone made by the pituitary gland. Its main role is telling the body when to start to make breast milk during pregnancy and breastfeeding.1,2 It also is involved in male and female reproductive health.1​​​​​​​​​​​​

Prolactin levels are usually low in men and women who are not pregnant.3​​​​​​​​​​​​

What is hyperprolactinaemia?

Hyperprolactinemia is a condition where there are high levels of prolactin in the blood.2

When prolactin levels are high this can have an impact on other sex hormones that may make it difficult to have a baby (known as infertility).1,4,5

What are the symptoms of


Irregular periods or missed period


Erectile dysfunction – unable to get an erection
Gynaecomastia – enlarged or swollen breasts


Galactorrhoea – milky discharge from the breast (not due to breastfeeding).
Infertility – unable to conceive a baby
Low libido – reduced sex drive
Osteopenia / osteoporosis – low bone mass or bone density

The symptoms below sometimes occur if you have a prolactinoma, which is a tumour that is usually noncancerous. Prolactinomas vary is size and when they are large they may cause pressure on nerves or parts of the brain.
​​​​​​​If this does occur, then these other symptoms may be experienced:​​​​​​​

Some people with hyperprolactinaemia might have no symptoms.6

How often do these symptoms occur with people who have hyperprolactinaemia?

Graph: Rate of symptoms in Women and Men with hyperoprolactinaemia1

How common is hyperprolactinaemia?​​​​​​​

Or in every group of 1000 people, 4 may have hyperprolactinaemia.2

Remember, not all people who have hyperprolactinaemia have symptoms and it may go unnoticed. It is usually only when people have symptoms that you may need to look into what is causing the high prolactin levels and potentially need treatment.7

What causes high prolactin?6

Prolactin levels can rise with some normal bodily functions, such as pregnancy, breastfeeding or stress. These usually temporary and the levels aren’t very high.

Some medications can cause an increase in prolactin.
These may include:

  • Some antipsychotics (medications for psychosis)
  • Some medications for depression (those in the class called Selective Serotonin Reuptake Inhibitors)

There are medical conditions that cause hyperprolactinaemia. More commonly, these are caused by prolactinomas.

Prolactinomas are tumours caused by the cells in the pituitary gland.
In most cases these tumours are not cancer (benign).7

According to Hormones Australia, around 450 people each year will be diagnosed with a prolactinoma in Australia.7

Prolactinomas are put into two groups based on their size:2,6



Smaller tumours
Less than 1 cm wide
Most common type: 90%
More likely in Women

Larger tumours
Larger than 1cm wide
Less common
More likely in Men

How do they diagnose hyperprolactinaemia?

Initially your doctor will arrange for you to do a blood test. They will look at the levels of prolactin in your blood.

It is recommended that you have your blood test taken a few hours after waking up and when you’ve been sitting quietly for a short time. This is because prolactin levels can change over the day and rise with levels of stress.2,3

However always following the instructions provided by your doctor as they may have reasons for doing the blood test at other times.3

If your prolactin levels are high, you may need further tests to work out exactly what is causing this. This might include a magnetic resonance imaging (MRI) scan.

To find more about these tests, including what to expect when going for your MRI click here to be taken to Hormones Australia website.

If it is likely that your medication may be the cause, your doctor may stop you having the medicine for a few days (72 hours) and see if your prolactin level goes back to normal after that time.6

Find out what happens next if you are diagnosed with hyperprolactinaemia here.

    PP-DOS-AUS-0002. 11/21.



    1. Melmed S, Casanueva FF, Hoffman AR, et al; Endocrine Society. Diagnosis and treatment of hyperprolactinemia: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2011;96(2):273-288.
    2. Majumdar A, Mangal NS. Hyperprolactinemia. J Hum Reprod Sci. 2013;6(3):168-175.
    3. Lab Tests Online Australasia. Prolactin. Available at: https://www.labtestsonline.org.au/learning/test-index/prolactin Accessed: 8th Nov 2021.
    4. Marieb EN, Hoehn K. Chapter 28: Pregnancy and human development. In: Human Anatomy & Physiology, 11th ed. Hoboken, NJ: Pearson Education; 2018.
    5. Kaiser UB. Hyperprolactinemia and infertility: new insights. J Clin Invest. 2012;122(10):3467-3468.
    6. Chen. AX. Australian Prescriber. Hyperprolactinaemia. 2017;40(6):220–224.
    7. Hormones Australia. Hyperprolactinaemia. Available at: https://www.hormones-australia.org.au/endocrine-diseases/hyperprolactinaemia/ Accessed: 8th Nov 2021.
    8. Colao A, Sarno AD, Cappabianca P, et al. Gender differences in the prevalence, clinical features and response to cabergoline in hyperprolactinemia. Eur J Endocrinol. 2003;148(3):325-331.

    External Resources

    -Hormones Australia: Hyperprolactinaemia
    -Australian Pituitary Foundation: Pituitary Tumours Fact Sheet

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