Ginger for Nausea and in Pregnancy: What Is Safe and Where the Limits Are

It is just after six. You are standing in the kitchen, and the smell of coffee, which you used to love, sends you rushing to the sink.

These questions deserve an honest answer. Behind reaching for the root is a need I understand well: to protect your baby and still get through the day.

That is why I look at ginger from several directions: studies in pregnant women, safety data from large cohorts, assessments by authorities and the KPNI lens. KPNI stands for Clinical Psychoneuroimmunology. It refers to the interplay of nerves, hormones, the immune system and metabolism.

You can find the broad overview of ginger, from period pain to osteoarthritis, in Ginger: effects and studies. This article is about nausea, about pregnancy and about the limits.

Why do you feel so sick in pregnancy?

Maybe someone told you it simply comes with the territory. And maybe you wonder why it hits you so hard while others barely notice it.

Nausea and vomiting affect up to 70 percent of all pregnant women. That is how an international team led by Fejzo summarised it in 2019 in a review for Nature Reviews Disease Primers. The severe form, hyperemesis gravidarum, is described there in 0.3 to 10.8 percent of pregnant women, depending on the definition.

For a long time, this nausea was considered a mystery. Research has now found a likely sender.

Picture the brainstem as a bouncer who checks every signal coming from the blood. GDF15 knocks, and the bouncer shouts: nausea. If you already know that knock, you are less startled. According to the study, the receptor for GDF15 sits only in the rear part of the brain.

Through the KPNI lens, this is a little textbook case. In the hormonal system, the placenta sends a signal. In the nervous system, the brainstem receives it and switches to nausea. And the immune system? GDF15 was described in Sydney in 1997 under the name MIC-1 in activated scavenger cells of the immune system. In the lab, it dampened the inflammatory response of these cells.

In metabolism, finally, what counts is the toll the nausea takes. If you barely eat and drink, you lose fluid, salts and vitamins. With severe vomiting, vitamin B1, thiamine, comes into focus in particular, because a deficiency can endanger the nervous system.

The American professional society for obstetrics and gynaecology, ACOG, writes in its guideline that pregnancy nausea is often played down and therefore undertreated. Some women do not seek support because they are worried about the safety of medication. The further the symptoms progress, the harder they become to control. Early treatment may prevent more serious complications, up to and including a hospital stay.

And now you know why your nausea is not in your imagination, but a signal with an address.

When does nausea in pregnancy become dangerous?

There are days when not even a sip of water stays down. By then at the latest, the question of ginger is secondary.

What exactly counts as hyperemesis was inconsistent for a long time. In 2021, an international group led by Jansen from Amsterdam agreed on a shared definition in a multi-stage consensus process. According to it, the symptoms begin before week 16 of pregnancy. Nausea and vomiting occur, at least one of them in a severe form. You can no longer eat or drink normally, and your daily life is severely restricted. Signs of dehydration support the diagnosis.

The 2024 British guideline of the Royal College of Obstetricians and Gynaecologists recommends classifying severity with a short questionnaire, such as the PUQE score. According to this guideline, ketones in the urine are not a suitable measure of dehydration. As first choice, it names well-studied medications, such as certain antihistamines or the combination of doxylamine and vitamin B6. If you are admitted to hospital because of vomiting, you should also receive thiamine.

And now you know at which point ginger stops being a question and becomes an appointment.

How might ginger work against nausea? Serotonin, stomach and balance

You bite into a piece of fresh ginger, and it burns on your tongue. Can something so pungent calm an irritated stomach?

Serotonin is one of the most important alarm substances in the digestive tract. Via 5-HT3 receptors on nerve cells, it can set off nausea. Picture the receptor as a doorbell: serotonin presses the button, and the alarm rings in your head. Drugs like ondansetron disconnect this bell.

The second possible pathway runs through the stomach. A team led by Wu from Kaohsiung in Taiwan gave 24 healthy volunteers 1200 mg of ginger or placebo before a soup. After ginger, the stomach was half empty after 13.1 minutes, after placebo only after 26.7 minutes. In this study, however, there was no difference in symptoms. A stomach that passes on its cargo more quickly might feel full and heavy for a shorter time.

The third pathway concerns balance. In 2003, a team led by Lien and Owyang exposed thirteen people prone to motion sickness to an optical rotation illusion that triggers nausea. After 1000 or 2000 mg of ginger, they felt less nauseous, the electrical rhythm of the stomach was thrown off less often, and the hormone vasopressin rose less sharply. This is where the nervous and hormonal systems meet: in the same study, vasopressin given as an infusion itself triggered nausea.

And now you know why something pungent might soothe a restless stomach.

What do studies show about ginger for nausea in pregnancy?

You do not want theory. You want to know whether women in your situation felt better with ginger.

Single studies can be misleading. That is why it is worth looking at the summaries. In 2014, a team led by Viljoen from Stellenbosch University in South Africa pooled twelve randomised trials with 1278 pregnant women. Nausea improved considerably more with ginger than with placebo. For vomiting, there was only a trend, not an established effect. The team rated the quality of the evidence as low.

In the same year, a Canadian team led by Thomson from Queen's University arrived at a similar picture with six placebo-controlled trials and 508 women. Around 1 gram of ginger daily for at least four days was associated there with about a five times higher chance of improvement.

Even the summaries themselves are not beyond doubt. In 2024, a team led by Li from Beijing examined fifteen meta-analyses on ginger for nausea. Their methodological quality ranged from critically low to low.

A detail from the regulatory world: in 2019, an application was submitted to the European Medicines Agency to recognise the relief of pregnancy nausea as a well-established medical use of ginger. In its 2025 revision, the Committee on Herbal Medicinal Products did not include it. There was no pivotal published study that would support such a use for mild nausea up to week 16.

And now you know why experts take ginger seriously and still do not get euphoric about it.

How much ginger was used in studies, and is more better?

One pack says 250 mg per capsule, the next one 500 mg. And in your cup of tea? Nobody knows exactly.

The Stellenbosch meta-analysis shows the range. Daily amounts ranged from 600 mg to 2500 mg, and most studies gave 1000 mg of powder over four days. The team suggests splitting the daily amount into three to four portions. In its subgroup analysis, less than 1500 mg per day tended to do better for nausea, but the team itself considers this analysis of limited reliability.

For herbal medicines, the herbal substance has to meet the requirements of the European Pharmacopoeia, as the EU monograph also points out. For dietary supplements, this does not apply in the same way. With tea, the amount depends on the piece of root, the cut and the steeping time. The pregnancy studies mostly worked with capsules, occasionally with syrup or biscuits.

And now you know why the amount helps decide between benefit and risk.

How safe is ginger in pregnancy?

You take folic acid, read every package leaflet twice and avoid raw milk cheese. Of course you want to know whether ginger could harm your baby.

The Embryotox centre at Charité in Berlin rates the extent of experience with ginger in pregnancy as high. According to Embryotox, several clinical studies with almost 1000 pregnant women showed no indication of an increased risk of malformations. Embryotox considers ginger at usual doses acceptable to take in all phases of pregnancy.

How do these assessments fit together? Both are largely based on the same studies, they simply ask different questions.

This is how I read the difference: Embryotox answers whether a risk can be identified based on current knowledge. The EU authority asks whether the safety of a medicine has been demonstrated by its strict standards. What it has in mind is medicines, not the spice in normal food.

And now you know why two reputable bodies can sound different without contradicting each other.

Ginger and blood thinners: how serious is the interaction?

You take an anticoagulant, perhaps phenprocoumon, or perhaps you inject heparin during pregnancy. And someone recommends ginger tea for your nausea.

Platelets are like little patches that clump together when you are injured. In 2015, a team led by Marx from Bond University in Australia systematically reviewed the studies on ginger and this clumping. Of eight clinical studies, four found less clumping and four found no effect. The team calls the evidence equivocal.

In twelve healthy men in Sydney, ginger at the recommended dose changed neither the INR nor platelet function, not even together with a single dose of the anticoagulant warfarin. That sounds reassuring. But healthy people taking a single tablet are not the same as people on long-term therapy.

In a Canadian observational study led by Shalansky, 171 people on warfarin kept a diary for 16 weeks. Those who took ginger reported bleeding a good three times as often, with an odds ratio of 3.20. In this study, ginger had no detectable influence on excessive INR values, and the bleeding was self-reported. A correlation is not yet proof of a cause.

Tea is not automatically harmless either when the amount gets large. In 2019, a team from Graz described a 36-year-old man on the anticoagulant rivaroxaban who suddenly coughed up blood. He had been drinking three litres of home-brewed ginger tea a day for a month. According to the EU assessment report, a platelet function test showed an inhibition that came close to that of the antiplatelet drug clopidogrel.

During pregnancy, some women receive low-dose aspirin or heparin injections. If that applies to you, discuss ginger capsules or large amounts of tea with your gynaecologist beforehand. This matters all the more because the Norwegian study saw slightly more bleeding after week 17 with ginger, even though this finding is uncertain.

There is an intriguing apparent contradiction here: ginger was tested against nausea in studies precisely around surgery. German summaries of product characteristics, on the other hand, advise stopping ginger medicines before planned surgery. You do not have to sort out this contradiction on your own. It belongs in your conversation with the anaesthetist.

And now you know why a root belongs on your medication list if you take anticoagulants.

When else is caution needed? Heartburn, gallstones and blood sugar

You drank ginger tea for the nausea, and now there is a burning behind your breastbone. Is that a coincidence?

Heartburn and stomach

The EU monograph lists stomach discomfort, belching, indigestion, heartburn and nausea as common side effects. Common there means: in 1 to 10 out of 100 people treated. So the same plant that is used against nausea can itself cause nausea. In the pregnancy studies, heartburn occurred numerically more often with ginger than with placebo, but the difference was not statistically significant. If you are prone to heartburn anyway, also read Understanding heartburn and acid blockers.

Gallstones

According to the EU assessment report, German summaries of product characteristics for ginger medicines advise people with gallstone disease to seek medical advice before use. A targeted PubMed search during the research for this article found no clinical study that examined ginger in gallstones. The advice therefore follows the precautionary principle. Severe upper abdominal pain with fever or yellowing of the skin needs immediate medical assessment. More on this in Gallstones: causes and risks.

Blood sugar and diabetes medication

In 2026, a Chinese team led by Chen pooled thirteen studies on ginger in type 2 diabetes. Fasting glucose was about 16 mg/dl lower, and the long-term value HbA1c 0.41 percentage points lower. The team itself considers this of limited clinical relevance. A Brazilian analysis led by Schumacher with five trials found no significant effect at all.

The committee of the EU authority also did not find enough evidence of an effect on blood sugar to include a warning. Low blood sugar caused by ginger has not been shown. If you inject insulin for gestational diabetes, a large effect is not to be expected. With regular ginger preparations, it is still worth a word with your diabetes team. You can read how cinnamon compares in Cinnamon and blood sugar.

Allergy, children, breastfeeding

According to the EU monograph, hypersensitivity reactions are possible, and their frequency is unknown. The monograph does not recommend ginger for motion sickness in children under six, and for all other uses the limit is 18 years. While breastfeeding, assessments differ: the EU monograph advises against it due to a lack of data, while Embryotox considers ginger acceptable and refers to experience with almost 30 mother-infant pairs.

And now you know why your stomach has a say when it comes to ginger.

Ginger for motion sickness, after surgery and during chemotherapy: what is supported?

The winding road to the holiday resort, the anaesthesia, the next round of chemotherapy. Nausea has many faces, and not every one of them suits the same root.

Motion sickness

The EU monograph lists the prevention of nausea and vomiting in motion sickness as a well-established medical use, for adults at 1 to 2 grams one hour before the start of travel. The assessment report is remarkably candid about this. The available studies are considered weak by today's standards, and the data do not sufficiently support the dosage. It was retained for reasons of regulatory continuity. The small study with the rotation illusion fits the picture: interesting, but with only thirteen people.

After surgery

In 2006, a Thai team led by Chaiyakunapruk pooled five studies with 363 people. A fixed dose of at least 1 gram of ginger lowered the risk of nausea and vomiting after surgery by about a third, with a relative risk of 0.69. In 2018, a Hungarian team led by Tóth from Szeged reached a more cautious result with ten studies and 918 people. Ginger reduced the severity of nausea, but its frequency and the need for additional medication did not fall significantly.

Chemotherapy

The meta-analyses agree less. A 2019 review led by Crichton with 18 studies found mainly less acute vomiting when ginger was taken in amounts up to 1 gram for more than three days, but no clear effect on nausea. In 2013, a Korean team led by Lee concluded from five studies with 872 people that the evidence does not support ginger during chemotherapy.

A French case report, summarised in the EU assessment report, links more than one litre of ginger drink a day to severe liver damage during treatment with a cancer drug. Such an interaction has not been proven. Still, it is a good reason to talk to your oncology team.

And now you know why the same root plays a different role on the ferry than in oncology.

What can you do now, in concrete terms?

You do not have to choose between ginger and medicine. You can combine both wisely, in the right order.

Perhaps behind your question about ginger there is a need for safety, for yourself and your baby. A first step could be to stop simply enduring your symptoms and to speak about them openly.

If iron tablets irritate your stomach on top of that, you can find more in Iron tablet side effects. How to keep an eye on your iron stores during pregnancy is explained in Iron deficiency in pregnancy. And you can read the broad overview of ginger beyond nausea in Ginger: effects and studies.

And now you know why a small root can do the most when it is part of a bigger plan.

Frequently asked questions about ginger for nausea and in pregnancy

Read more in the ViveCura guide

These articles connect directly to this topic.