High Prolactin in Women: Symptoms, Causes and Why It Needs a Doctor

By Tina Chagoury, Clinical Dietitian · 6 min read · 2026-09-27

High prolactin is common and usually treatable, but it always needs a doctor to find the cause. Here are the symptoms, the causes and where nutrition fits.

Your periods have become irregular or stopped altogether. Perhaps you have noticed a milky discharge from your nipples even though you are not breastfeeding, or you have been trying to conceive without success. Or a blood test came back with prolactin flagged high, and nobody explained what that means.

High prolactin is common, it is usually treatable, and it always needs a doctor to find the cause. Here is what it is, the symptoms of high prolactin in women, what raises it, and where nutrition genuinely fits.

What prolactin does

Prolactin is made by the pituitary gland, a small gland at the base of the brain. Its main job is to produce breast milk after birth.

It has a second job that explains most of the symptoms. Prolactin suppresses the signals from the brain that drive ovulation. That is why breastfeeding often delays the return of periods. When prolactin is high outside pregnancy and breastfeeding, the same thing happens: ovulation becomes irregular or stops, and estrogen falls.

Symptoms of high prolactin in women

• Irregular periods, or periods that stop
• A milky discharge from the nipples when you are not pregnant or breastfeeding
• Difficulty conceiving
• Low libido
• Vaginal dryness, because estrogen is lower
• Headaches or changes in your vision, which can happen if a growth on the pituitary presses on nearby nerves
• Over time, bone loss, again because estrogen stays low

Some women have no symptoms at all, and high prolactin is found on a routine test.

What about symptoms before your period?

Breast tenderness in the days before a period is very common and usually reflects the normal rise and fall of estrogen and progesterone, not prolactin. What points more towards prolactin is a cycle that becomes irregular or stops, spotting, or nipple discharge when you are not breastfeeding.

What causes high prolactin

• Pregnancy and breastfeeding. The normal reason, and the first thing a doctor rules out.
• Stress, poor sleep and intense exercise. These can raise prolactin temporarily, and so can the stress of the blood test itself. This is one reason a mildly high result is usually repeated. If you want to understand the stress pathway, read The HPA Axis: Why Stress Is a Physical Condition, Not a Mood.
• An underactive thyroid. When the thyroid is underactive, the brain releases more of the hormone that stimulates it, and that same hormone also stimulates prolactin. Treating the thyroid often brings prolactin down. I cover the thyroid side in Hypothyroidism Symptoms in Women.
• Medicines. Some antidepressants and antipsychotics, some anti sickness medicines, some blood pressure medicines and opioid pain relief can raise prolactin. Never stop a medicine on your own. Tell your doctor everything you take.
• A prolactinoma. This is a benign growth on the pituitary gland that makes prolactin. Most are small. It is not cancer, and it usually responds well to medication prescribed by an endocrinologist.
• Kidney or liver disease, which slows how the body clears prolactin.
• Macroprolactin. Sometimes the test picks up a large, inactive form of prolactin. The number looks high but the body is not affected. Labs can check for this.

High prolactin and trying to conceive

Many women only discover high prolactin when a pregnancy does not happen. The reason is simple. Raised prolactin can stop ovulation, and without ovulation there is no pregnancy. The encouraging part is that once the cause is found and treated, whether that is an underactive thyroid, a medicine or a small pituitary growth, ovulation often returns. If you are trying to conceive, tell your doctor early rather than waiting, so that testing starts alongside everything else.

Why high prolactin always needs a doctor

A high prolactin result is a finding, not a diagnosis. The cause decides the treatment, and finding the cause belongs with a doctor, usually a gynaecologist or an endocrinologist.

The usual process includes a repeat blood test taken in a calm setting, a pregnancy test, thyroid tests, kidney and liver function, a careful review of your medicines, and sometimes a check for macroprolactin. If prolactin stays high without another explanation, an MRI scan of the pituitary is the next step.

If a prolactinoma is found, the treatment is usually medication that lowers prolactin, chosen and monitored by your doctor. Supplements do not treat it.

A sudden, severe headache with changes in your vision needs urgent care the same day.

Where nutrition and lifestyle fit

Nutrition does not treat a prolactinoma or replace thyroid medication. What it can do is support the systems around prolactin and protect you from its side effects.

• Sleep and stress. Stress and broken sleep push prolactin up alongside cortisol. Regular sleep and a real recovery routine are the first things I work on.
• Thyroid support. Your thyroid needs iodine, selenium, iron and zinc to work properly. Most women can meet this through food: fish, eggs, dairy, meat, pulses, nuts and seeds. Do not take iodine supplements without medical advice, especially if you have a thyroid condition.
• Stable blood sugar. Protein at every meal and fewer spikes reduce the stress signalling that feeds into the whole system.
• Eat enough, train sensibly. Undereating and heavy training suppress ovulation on their own and make the picture harder to read.
• Protect your bones. While estrogen is low, bone needs protein, calcium, vitamin D and strength training. See Bone Loss Is Silent Until It Is Not.

You will see vitamin B6 and chasteberry promoted online to lower prolactin. Neither is a substitute for finding the cause, and chasteberry can interfere with hormonal medicines and fertility treatment. Do not use them to treat a high result on your own.

When to see a doctor

• Any prolactin result flagged high
• Nipple discharge when you are not pregnant or breastfeeding, especially if it is bloody or comes from one breast only
• No period for three months or more, and you are not pregnant
• Difficulty conceiving
• Headaches with changes in your vision, which is urgent

This article is nutrition education, not medical advice. High prolactin must be diagnosed and treated by your own doctor.

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About the author. Tina Chagoury is a licensed clinical dietitian specialising in women's hormonal health, inflammation and gut health, and the creator of the Hormone Reset Method™. Learn more about the Hormone Reset Method.

Frequently asked questions

What are the symptoms of high prolactin in women?

Irregular or absent periods, milky nipple discharge, difficulty conceiving, low libido and vaginal dryness are the most common. Headaches and vision changes can happen when a pituitary growth is large.

Can stress raise prolactin?

Yes, temporarily. Stress, poor sleep, intense exercise and even the blood test itself can raise it, which is why a mildly high result is usually repeated before anything else is done.

Is high prolactin dangerous?

It is usually not dangerous in itself, and the most common causes are treatable. It does need a proper assessment, because low estrogen affects fertility and bones, and a large pituitary growth can affect vision.

Can I get pregnant with high prolactin?

High prolactin can stop ovulation, which makes conceiving harder. Once the cause is found and treated, ovulation often returns. Your doctor will guide this.

Can food lower prolactin?

Food does not treat the causes of high prolactin. It supports sleep, stress, thyroid function and bone health around the medical treatment.

Related reading

• Why a Normal TSH Does Not Mean Your Thyroid Is Fine
• The Blood Tests Every Woman Over 35 Should Actually Ask For
• Estrogen in Women: What It Does and Why It Goes Out of Balance