Prolactin is made by your pituitary gland, and its day job is milk production. When it runs high outside of breastfeeding, the symptoms look a lot like PCOS symptoms, which is exactly why it gets missed.
What Counts as High
In women who are not pregnant, normal is roughly 4 to 25 ng/mL. Between 25 and 100 is mildly high. Above 100 is a lot, and needs looking into properly.
Most women with PCOS who have this land in the mild band.
The reason the two tangle is that they use the same wiring. Both act on the hypothalamic-pituitary-ovarian axis, the line between your brain and your ovaries.
When prolactin climbs, it damps down the hormones that trigger ovulation, right on top of the ovulation problem PCOS already gave you.
Between 15 and 30% of women with PCOS have mildly high prolactin. That is common enough that it belongs in every PCOS work-up, and certainly if your periods are irregular, you are struggling to conceive, or you have any breast discharge.
What It Feels Like
Mostly it makes your existing symptoms louder. Periods get further apart, or stop.
PCOS alone does that too. The difference is degree: add high prolactin and the gaps get longer, or your period goes altogether.
The one symptom that points straight at prolactin is galactorrhea: milk when you are not pregnant and not nursing. PCOS on its own does not do this, so it is the clearest tell there is.
For some women it is a drop or two when squeezed. For others it leaks.
Fertility takes the hardest hit. High prolactin blocks the hormone signal that releases an egg, and that lands on top of the insulin resistance and hormone imbalance of PCOS. Two brakes on the same wheel.
Other Signs
Sex drive drops for a lot of women, because high prolactin pushes estrogen and testosterone down. Headaches and vision trouble can mean a prolactinoma, a small growth on the pituitary, though that is less common.
Any change in your vision, or a severe headache, is a same-week appointment. Not a wait-and-see.
Mood often slides too. PCOS is already tied to depression and anxiety, and high prolactin adds another hormonal push in the same direction.
If your mood is getting worse alongside the other signs here, ask to have prolactin tested.
Why It Goes Up
Medication is the most common reason by a distance. Antipsychotics, antidepressants, some blood pressure drugs and anti-nausea drugs all raise it.
If you take any of those and your prolactin is high, ask your doctor what else you could take. Do not stop anything on your own.
An underactive thyroid does it too. When thyroid hormone drops, your pituitary makes more TSH, and the same signal can push prolactin up with it.
Thyroid problems are more common in PCOS than in other women, so this one comes up often.
Prolactinomas are non-cancerous pituitary growths that make prolactin. They are usually small and respond well to tablets. PCOS does not make you more likely to get one.
But because the symptoms overlap, telling them apart matters.
Stress and Sleep
Long-running stress raises cortisol, and cortisol feeds into prolactin. Women with PCOS carry more of that stress, which builds a loop: the stress raises the hormone, the hormone worsens the symptoms, the symptoms raise the stress.
Short sleep does it too, because prolactin naturally peaks while you sleep.
Hard endurance training without enough rest can push it up for a while. Exercise is good for PCOS, but the dose matters.
Training hard while under-eating is metabolic stress, and it knocks several hormones out at once, prolactin among them.
Treatment
What you do depends on why it is high and how high it is. If a drug is causing it, switching often solves it outright. Your doctor may change the dose or move you to something that does not touch prolactin.
Again: never stop a prescription on your own.
For a prolactinoma, or for levels that are properly high, the first-line drugs are dopamine agonists: cabergoline or bromocriptine. They work by imitating dopamine, which is what tells your body to stop making prolactin.
Cabergoline is usually preferred. It is easier to tolerate and you take it less often.
Most women see levels come down within weeks. Periods usually come back, and fertility improves as ovulation restarts. The early side effects are nausea, dizziness and headaches.
Take it with food and start on a low dose. That handles most of it.
If Your Thyroid Is the Cause
Treat the thyroid and you often treat the prolactin at the same time. As thyroid levels come right, prolactin tends to follow without anything else being added. You just need your dose checked regularly.
This is a good argument for testing your hormones as a set rather than one at a time. Plenty of women find that sorting out their thyroid improves several PCOS symptoms, not only this one. Find a doctor who is comfortable with both conditions.
What You Can Do Without Drugs
Medication is the answer when levels are properly high. For mild elevation, lifestyle does real work. Stress is the first lever.
Meditation, yoga, slow breathing and actual sleep all calm the stress response that pushes prolactin up.
Vitamin B6 helps your body make dopamine, and dopamine is what holds prolactin down. Some studies suggest B6 helps mild elevation.
Doses used are 100 to 200 mg a day. Ask your doctor before you start.
Vitamin E is an antioxidant that may help steady hormones, prolactin included. The research is mixed, but getting enough is good for your reproductive health either way. Nuts, seeds and leafy greens.
Herbs and Food
Vitex, also called chasteberry, has long been used for hormone balance and may bring mild elevation down. It acts on dopamine receptors, which is the same route the drugs use.
The evidence is thin though, and vitex interacts with medication, so do this one with your doctor.
Keeping your blood sugar steady helps your hormones across the board. No food lowers prolactin directly, but easing insulin resistance supports the whole system.
Protein, good fats and fibre. Less refined carbohydrate.
The same logic behind PCOS tea applies here: gentle support alongside treatment, not instead of it. Tell your doctor about any herb you take, especially on a prescription.
Getting Tested Properly
The test is easy to get wrong. Prolactin swings through the day and peaks at night, so blood should be drawn in the morning, at least two hours after you wake.
You do not need to fast. Do avoid breast stimulation and sex for 24 hours beforehand.
Being stressed during the draw can spike it on its own, which produces false positives. If your first result is high, ask for a repeat before you start any treatment.
Some clinics test three times with a drip line already in, 20 minutes apart, so the needle stress has time to settle.
Once you are on treatment, most doctors recheck every three to six months and adjust the dose. When it has been stable a while, you can space that out.
Fertility and Pregnancy
High prolactin stops you ovulating, and even mild elevation can disrupt the signals that mature and release an egg. If you have PCOS and you are trying to conceive, fixing this often restores ovulation on its own.
Dopamine agonists restore fertility in most women. Many ovulate within a few months of levels coming down. That happens whether or not you are treating the rest of your PCOS, though doing both works better.
In pregnancy prolactin rises naturally, which is the point of it. Women who conceived while on a dopamine agonist usually stop it once pregnancy is confirmed.
Your doctor will tell you what applies to you.
Breastfeeding
You can breastfeed. High prolactin when you are not pregnant is a problem; the rise during breastfeeding with PCOS is exactly what is meant to happen.
Some women with PCOS do struggle with supply, but that traces back to insulin resistance and hormone balance, not to a prolactin problem you had before.
Is It PCOS, High Prolactin, or Both?
It matters, because they are treated differently. Both cause irregular periods and fertility trouble, but there are tells. Milk when you are not nursing points at prolactin.
Many follicles on an ultrasound plus high androgens points at PCOS.
Some women have both and need both treated. The blood work that sorts it out is prolactin, testosterone, LH, FSH and thyroid hormones, with a pelvic ultrasound alongside.
Knowing which one is driving your symptoms tells you where to start. If the elevation is mild and comes from PCOS-related stress or metabolism, treating the PCOS may bring prolactin down by itself.
Properly high prolactin needs its own treatment, PCOS or not.
A signs of PCOS quiz can help you see whether your symptoms sit in classic PCOS territory or point at something else worth testing.
Living With It
This needs keeping an eye on rather than fixing once. Regular follow-up is how you know the treatment is still working.
Prolactinomas often mean long-term medication, though small ones sometimes shrink enough to come off it.
Lifestyle carries real weight here. Seven to nine hours of sleep keeps prolactin's natural rhythm intact.
So does whatever genuinely lowers your stress, whether that is exercise, therapy, or something you make with your hands. Cortisol is the thing you are aiming at.
Food that improves insulin sensitivity helps everything else. No diet lowers prolactin directly, but budget-friendly PCOS meals that hold your blood sugar steady take load off the whole system.
Keep good PCOS snacks around so you are not crashing between meals, which is its own hormonal stress.
When to Call Your Doctor
Some things do not wait. Vision changes, a severe headache, or galactorrhea that suddenly gets worse can mean a pituitary tumour growing. Most are benign and slow, so a fast change is the thing that matters.
On a dopamine agonist, ring your doctor if you get nausea you cannot manage, severe dizziness, or a change in mood. Usually a dose change fixes it and you stay on treatment.
If your prolactin is normal and you have been trying to conceive for six months without luck, ask for a fertility review. Normalising prolactin restores ovulation in many women, but PCOS can still be blocking it on its own.
Where This Fits
Prolactin is one piece. The rest is insulin resistance, androgens, ovulation, and the symptoms you see in the mirror like acne and unwanted hair.
Supplements help some women. Read up on the best supplements for PCOS and take inositol, NAC or vitamin D to your doctor as a question. A DIM supplement supports how you clear estrogen, which sits alongside this work.
A meal plan built around your own symptoms takes the guesswork out of the food side, which is the part you deal with three times a day.
Eating consistently is what supports every hormone here, prolactin included.
This is manageable. Medication where it is needed, lifestyle where it helps, and a doctor who is looking at the whole picture. Hormones take time to settle, so give it time.
Research Methodology and Scientific Sources
This article draws on peer-reviewed research and on health bodies that specialise in endocrine disorders. What we say about prolactin and PCOS comes from clinical studies in reproductive endocrinology journals.
The National Institute of Child Health and Human Development covers pituitary disorders including hyperprolactinemia. Their work informs what we say about testing, normal ranges and treatment.
The guidance on diagnosing and managing PCOS comes from the American College of Obstetricians and Gynecologists and from the international PCOS consensus statements. That is what shapes our view on when prolactin should be tested.
What we say about dopamine agonists comes from clinical trials and prescribing information reviewed by the Food and Drug Administration. We stick to treatments with an established safety record.
The figures on how common high prolactin is in PCOS come from population studies and systematic reviews. The National Institute of Diabetes and Digestive and Kidney Diseases covers the hormonal disorders that affect metabolism and reproduction.
We update this article as new research lands, so it keeps pace with what is actually known about treating PCOS alongside high prolactin.
Frequently Asked Questions
What is a normal prolactin level if I have PCOS?
The same as for anyone else: roughly 4 to 25 ng/mL. Having PCOS does not change the target, it just makes you more likely to sit above it.
Between 25 and 100 is mild, and whether it needs treating depends on your symptoms and whether you want to get pregnant. Above 100 is high enough to look for a prolactinoma or another clear cause.
Prolactin belongs in your PCOS work-up, and definitely if your periods are irregular, you are trying to conceive, or you have any breast discharge. Get the blood drawn in the morning, because the number moves through the day.
More on testing and ranges: prolactin levels and PCOS.
Can high prolactin cause PCOS, or make it worse?
It cannot cause it. PCOS comes from insulin resistance, hormone imbalance and your genes, none of which are about prolactin.
It does make it worse. High prolactin blocks the hormones that trigger ovulation, so it lands on an ovulation problem you already had. Periods get further apart and conceiving gets harder.
The overlap happens because both act on the same axis between your brain and your ovaries.
The good news is that treating the prolactin usually helps a lot: cycles come back and fertility improves. That is the argument for testing your hormones as a set instead of guessing.
How long until my prolactin comes down on treatment?
Most women see it drop within two to four weeks of starting cabergoline or bromocriptine, and reach normal within two to three months.
It depends on how high it was and why. A prolactinoma can take six months or more, especially a larger one.
Periods often come back before the number is fully normal, usually in one to three months. Ovulation can return sooner than that, which matters if you are not trying to get pregnant.
Expect your levels checked every few months at the start, with the dose adjusted as needed. If it is not falling as it should, that is a reason to look harder at the cause.
The natural route, stress work and B6, can help mild elevation, but give it several months of consistency before you judge it.
Do I need medication for slightly high prolactin?
It depends on the number and on your symptoms. Between 25 and 40 ng/mL with no real symptoms often does not need treating, especially if you are not trying to conceive.
Your doctor may suggest lifestyle changes and monitoring instead. Above 40, or with galactorrhea, fertility plans, or periods that are wrecking your life, medication makes sense.
Dopamine agonists restore ovulation and regular cycles in most women, and they treat the prolactin and its knock-on PCOS symptoms together. They have a good safety record when monitored, though nausea and dizziness are common at the start.
Talk it through in terms of your own numbers and your own goals. Some women want to try the natural route first at borderline levels. Others would rather just start.
One exception: if you are trying to conceive, treating it helps a lot, however mild it looks.
Can the stress of having PCOS raise my prolactin?
Yes. Stress raises cortisol, and cortisol can push prolactin up.
Women with PCOS carry more of it: the symptoms, how you feel about your body, fertility worry, the metabolic side. That makes a loop, where the stress raises prolactin and the prolactin worsens the symptoms that caused the stress.
But stress alone usually only nudges it. It does not produce the big numbers you see with a prolactinoma or a drug side effect. If yours is only slightly high and nothing else explains it, stress work is the obvious place to start.
Meditation, sleep, moderate exercise and therapy all lower stress hormones and may bring prolactin down over time.
Do not stop at stress, though. Thyroid problems, medication and pituitary tumours all need ruling out first. Stress work supports the treatment, it does not replace it.
Community Comments
Add a comment