Pregnancy nausea: causes, natural remedies, and anti-nausea diet

By: Julia Ebbens (Nutritionniste) — 21/02/2026

If you are reading this article, chances are you are already familiar with the unpleasant sensation that accompanies early pregnancy. You are not alone: pregnancy nausea is among the most common symptoms of the first trimester. Know that there are concrete, science-backed solutions to ease it. We explain everything in this comprehensive guide: why it occurs, how long it lasts, what to do to calm it, and when to see a doctor.

When does pregnancy nausea start and end?

Pregnancy nausea follows a fairly predictable timeline, directly linked to the hormonal changes of the first trimester. The majority of pregnant women begin to feel nauseous between the 4th and 8th week of pregnancy (i.e., between 6 and 10 weeks of amenorrhea). This is when the HCG level, the famous pregnancy hormone, undergoes its most rapid rise.

The nausea peak is generally between 9 and 10 WA. This is often the most difficult period, when pregnancy vomiting can be most intense and fatigue accumulates. First trimester nausea then gradually subsides and disappears for most women between 12 and 16 WA, at the beginning of the second trimester.

However, it is important to note that about 10% of women continue to experience nausea beyond the first trimester, and a minority suffer from it throughout the entire pregnancy. If this is your case, do not hesitate to talk to your doctor or midwife.

Despite their common name of "morning sickness," this nausea can actually occur at any time of the day — morning, afternoon, evening, or even at night. The English term morning sickness is therefore misleading. For some women, the nausea is nearly constant during the peak period.

Here is some reassuring information that can help put things in perspective: a study published in JAMA Internal Medicine in 2016 showed that pregnancy nausea and vomiting are associated with a 50 to 75% reduced risk of miscarriage. Researchers interpret this nausea as a sign of normal placental development and a viable pregnancy.

Why do you get nauseous during pregnancy?

The exact causes of pregnancy nausea are not fully understood, but research has identified several factors that act synergistically. Understanding these mechanisms can help you better cope with this period, knowing that your body is doing exactly what it should.

HCG hormone (human chorionic gonadotropin)

The rapid increase in HCG levels during the first trimester is the most commonly cited factor. This hormone, produced by the placenta from embryo implantation, roughly doubles every 48 hours during the first few weeks. This surge coincides perfectly with the onset of nausea, and their disappearance generally corresponds to when HCG levels stabilize, around 12-14 WA. Multiple pregnancies, where HCG levels are even higher, are indeed often accompanied by more pronounced nausea.

Estrogens and progesterone

Estrogen levels increase considerably during pregnancy and contribute to nausea by acting on brain centers that control vomiting reflexes. Progesterone, for its part, plays an indirect but significant role: it slows intestinal transit and gastric emptying, which causes a feeling of heaviness, bloating, and nausea. This digestive slowdown can also worsen acid reflux, another common pregnancy symptom.

Heightened sensitivity to smells

Many pregnant women develop hyperosmia — an exaggerated sensitivity to smells — from the first weeks of pregnancy. Previously unremarkable odors (cooking, perfume, coffee) suddenly become unbearable and immediately trigger nausea. This hypersensitivity is thought to be linked to the increase in estrogen and may serve as an alert mechanism against potentially harmful substances.

An evolutionary protective mechanism

A fascinating theory supported by several evolutionary biology researchers suggests that pregnancy nausea is a protective mechanism for the mother and embryo. By triggering a natural aversion to certain foods — meat, fish, eggs, strong-tasting foods — the body would reduce exposure to foodborne pathogens (salmonella, listeria, toxoplasma) precisely during the most critical period of embryonic development. This hypothesis would explain why nausea is most intense during the first trimester, when the embryo is most vulnerable to toxins.

The anti-nausea diet: what to eat when you have nausea during pregnancy?

Diet plays a central role in managing pregnancy nausea. Adapting your diet is often the first measure recommended by healthcare professionals, and for good reason: what you eat, when you eat, and how you eat can make a considerable difference in nausea intensity.

Eat little but often: the golden rule

Instead of three traditional meals, split your food intake into 5 to 6 mini-meals spread throughout the day. An empty stomach worsens nausea (gastric acidity increases), while an overfull stomach causes feelings of heaviness and bloating. The goal is to maintain a regular and moderate intake, never reaching either hunger or excessive fullness. This split approach is also beneficial for stabilizing blood sugar and reducing the risk of gestational diabetes.

Crackers before getting up

One of the simplest and most effective tips: keep crackers, rusks, or rice cakes on your nightstand. Eat a few before even getting out of bed in the morning. The empty stomach upon waking is one of the main triggers of morning sickness. These dry carbohydrates absorb excess stomach acid and stabilize blood sugar after the overnight fast.

Prefer cold foods rather than hot

Cold or room-temperature foods give off much fewer odors than hot dishes. When smell sensitivity is heightened, this difference is crucial. Opt for salads, cold sandwiches, yogurts, fresh fruit, fromage blanc, or applesauce. If you need to cook food, ventilate the kitchen well or ask someone else to cook when possible.

Focus on starches and dry foods

Dry foods and starches are your best allies during this period. White rice, plain pasta, potatoes, toast, low-sugar cereals, and rusks are generally well tolerated, even on the hardest days. They are easy to digest, provide energy, and have little odor.

Foods to avoid

Certain foods are known nausea triggers during pregnancy. Avoid as much as possible fatty and fried dishes (which slow digestion even further), very spicy foods, strong-smelling dishes (garlic, onion, cooked fish), coffee (whose smell alone is often enough to trigger nausea), and sugary carbonated drinks. Very sugary foods on an empty stomach can also cause a blood sugar spike followed by a drop, which worsens nausea.

Drink between meals, not during

Hydration is essential, especially if you are vomiting. But drinking large amounts during meals dilutes digestive juices and increases gastric volume, which can worsen nausea. Prefer to drink in small sips between meals. Still water, lemon water, ginger or peppermint teas are generally well tolerated. If plain water makes you nauseous, try sparkling water in small sips.

Anti-nausea mini-meal examples

• Upon waking: 2-3 crackers or rusks, a few sips of lemon water
• Breakfast (30 min later): plain yogurt with a banana, buttered toast. For more ideas, see our article on the ideal breakfast for pregnant women.
• Mid-morning snack: a handful of almonds and applesauce
• Lunch: white rice with cold chicken, green salad, a piece of fruit
• Afternoon snack: fromage blanc with a little honey, rice cakes
• Light dinner: plain pasta with Parmesan, steamed zucchini

Ginger: a scientifically proven remedy against pregnancy nausea

Ginger is arguably the most studied and most recommended natural remedy for pregnancy nausea. Its effectiveness is not just a folk remedy: it is supported by numerous clinical studies and recognized by reference organizations such as the ACOG (American College of Obstetricians and Gynecologists) and the CNGOF.

A meta-analysis published in Nutrition Journal examined 12 randomized controlled trials including over 1,200 pregnant women. The results show that ginger significantly reduces nausea compared to placebo, with no notable adverse effects for the mother or fetus. Its mechanism of action relies primarily on its effect on serotonin receptors in the gastrointestinal tract and its ability to accelerate gastric emptying.

How to use ginger during pregnancy

• Fresh ginger tea: grate about 1 g of fresh ginger (equivalent to one teaspoon) into a cup of hot water. Let it steep for 5 to 10 minutes, strain, and drink. You can add a little honey and lemon to soften the taste. Up to 3-4 cups per day.
• Crystallized ginger: convenient to carry, it can be nibbled throughout the day. However, watch the sugar content.
• Ginger cookies: a pleasant option that combines the anti-nausea effect of ginger with dry carbohydrates.
• Ginger capsules: 250 mg, 4 times per day (1 g per day total). This is the most studied dosage in clinical trials.

The maximum recommended dose is 1 to 1.5 g of dried ginger per day (or the equivalent in fresh ginger, approximately 4 to 5 g). At these doses, ginger is considered safe during pregnancy according to available studies. If in doubt, ask your doctor or midwife for advice.

Vitamin B6 (pyridoxine): a science-backed ally

Vitamin B6, or pyridoxine, is one of the first-line treatments recommended by the ACOG for pregnancy nausea. Its effectiveness has been demonstrated in several randomized clinical trials. The recommended dosage is 25 mg, three times daily (75 mg total). Several studies show that it significantly reduces nausea intensity, particularly at the beginning of treatment.

The safety limit is set at 200 mg per day during pregnancy. Before starting supplementation, it is important to check the amount of B6 already present in your prenatal vitamins to avoid overdosing. Prolonged excess vitamin B6 can cause peripheral neuropathies (tingling in hands and feet).

You can also increase your B6 intake through food. The foods richest in vitamin B6 are:

• Banana (0.4 mg per medium fruit)
• Avocado (0.3 mg per half avocado)
• Chicken and turkey (0.5 mg per 100 g)
• Chickpeas (0.5 mg per 100 g cooked)
• Potatoes with skin (0.4 mg per medium potato)
• Sunflower seeds (0.5 mg per 30 g)

Incorporating these foods into your daily mini-meals can effectively complement supplementation and help ease first trimester nausea.

Other natural remedies for pregnancy nausea

Acupressure: the P6 point (Neiguan)

Acupressure of the P6 point, also called the Neiguan point, is a technique from traditional Chinese medicine. This point is located on the inner surface of the forearm, approximately three finger- widths (2 cm) above the wrist crease, between the two tendons. Firm and regular pressure on this point, for a few minutes several times a day, can help reduce nausea.

Acupressure bracelets, available at pharmacies, apply continuous pressure to the P6 point. Several studies, including one published in the Journal of Reproductive Medicine, have shown a significant reduction in morning sickness symptoms in women using these bracelets compared to a placebo group. The major advantage of this method is the complete absence of side effects: it can be used in combination with all other approaches.

Aromatherapy: lemon and peppermint

Aromatherapy offers an interesting approach for relieving pregnancy nausea. Lemon essential oil is the most studied in this context: a randomized Iranian study showed that inhaling lemon essential oil significantly reduced pregnancy nausea and vomiting within the first 48 hours of use. In practice, place 2 to 3 drops on a tissue and breathe it in when nausea strikes.

Peppermint also has interesting anti-nausea properties. Its fresh scent can counterbalance nauseating odors and quickly soothe the feeling of queasiness. You can use a cold diffuser or simply inhale a few drops placed on your wrist. However, peppermint essential oil should not be ingested during pregnancy, and its use should remain occasional and by olfactory route only.

Diaphragmatic breathing

Deep diaphragmatic breathing is a simple and accessible tool for managing acute nausea episodes. By activating the parasympathetic nervous system, it reduces stress and tension that amplify nausea. Inhale slowly through the nose for 4 seconds, inflating the belly, hold for 2 seconds, then exhale slowly through the mouth for 6 seconds. Repeat 5 to 10 times. This technique can be practiced anywhere and at any time. Studies have shown that active relaxation reduces both the frequency of nausea episodes and their psychological impact.

Rest and stress management

Fatigue and stress are known aggravating factors for pregnancy nausea. The first trimester is a demanding period for the body, and rest should be a priority. Try to get enough sleep at night, take short naps during the day if possible, and don't hesitate to ease up on your activities. Gentle prenatal yoga, meditation, and progressive muscle relaxation exercises can also help you get through this period better.

When to see a doctor?

The vast majority of pregnancy nausea, although unpleasant, poses no danger to you or your baby. However, certain warning signs should prompt you to see your doctor, midwife, or go to the maternity emergency room:

• Inability to keep any food or liquid down for more than 24 hours: if you can no longer eat or hydrate at all, there is a risk of dehydration and deficiencies.
• Weight loss exceeding 5% of your pre-pregnancy weight: this may indicate a severe form of nausea requiring medical management. To track your weight progression, see our article on weight gain during pregnancy.
• Signs of dehydration: dark and scant urine, dry mouth, dizziness when standing up, rapid heart rate.
• Fever above 38°C (100.4°F) associated with vomiting.
• Blood in vomit (reddish or "coffee ground"-colored vomit).
• Intense abdominal pain accompanying vomiting.

Never hesitate to consult, even just for an opinion. Healthcare professionals are there to support you and there is no such thing as a pointless question when it comes to your health and your baby's. Better to have an "unnecessary" consultation than to delay getting help.

Hyperemesis gravidarum: when nausea becomes severe

Hyperemesis gravidarum is the severe form of pregnancy nausea and vomiting. It affects approximately 1 to 3% of pregnant women and differs from "ordinary" nausea by its intensity and its impact on overall health. This condition was brought to public attention when Kate Middleton, Princess of Wales, suffered from it during all three of her pregnancies, each time requiring hospitalization.

How to recognize hyperemesis gravidarum?

Unlike ordinary nausea that is bothersome but manageable, hyperemesis gravidarum is characterized by:

• Uncontrollable vomiting (more than 3 to 4 episodes per day), making all eating impossible
• Weight loss exceeding 5% of pre-pregnancy weight
• Clinical dehydration (persistent skin fold, tachycardia, hypotension)
• Metabolic disturbances: ketonuria, electrolyte imbalances
• Major impact on daily life: inability to work, care for children, social isolation

Management of hyperemesis gravidarum

Treatment of hyperemesis gravidarum depends on its severity. In moderate forms, outpatient treatment with antiemetics may suffice. In severe forms, hospitalization is necessary for:

• Intravenous rehydration: infusion of saline solution and glucose solutions to correct dehydration and electrolyte losses.
• Medication: doxylamine + vitamin B6 combination as first-line treatment, ondansetron as second-line if needed.
• Supplementation: with thiamine (vitamin B1) to prevent Wernicke encephalopathy, a rare but serious complication.
• Nutritional support: gradual reintroduction of food once vomiting is controlled.

The prognosis for hyperemesis gravidarum is reassuring: with appropriate management, serious complications are rare and the baby develops normally in the vast majority of cases. However, it is essential not to trivialize this condition or let the situation deteriorate. If you suspect hyperemesis gravidarum, seek medical help without delay.

Antiemetic medications during pregnancy

When natural remedies are not enough to control pregnancy vomiting, antiemetic medications can be prescribed by your doctor. It is essential never to self-medicate during pregnancy: only a healthcare professional can assess the benefit/risk ratio of a medication for you and your baby.

Doxylamine + vitamin B6: the first-line treatment

The combination of doxylamine (an antihistamine) and vitamin B6 is the first-line treatment recommended by the CNGOF and ACOG. This combination has marketing authorization in France for the treatment of pregnancy nausea and vomiting. Its safety profile is extremely well documented: studies involving over 200,000 pregnancies have shown no increased risk of fetal malformation. The main side effect is drowsiness, which can actually be beneficial for women suffering from nausea-related insomnia.

Ondansetron: as second-line treatment

Ondansetron (Zofran) is a potent antiemetic used as second-line treatment when the doxylamine + B6 combination is not sufficient. It works by blocking serotonin receptors involved in the vomiting reflex. Its use during pregnancy is subject to discussion: some studies have suggested a very slight increased risk of cleft lip when used in the first trimester, but this risk remains low and must be weighed against the consequences of untreated severe vomiting. It is strictly reserved for medical prescription.

Metoclopramide: not recommended

Metoclopramide (Reglan), long used as an antiemetic, is now not recommended during pregnancy due to its potential neurological effects (involuntary movements, extrapyramidal syndrome). It should not be used without specific medical advice.

The essential message: do not suffer in silence. If pregnancy nausea impacts your quality of life despite lifestyle measures, talk to your doctor. Safe and effective solutions exist.

Our expert's opinion

"Pregnancy nausea is one of the most common reasons for consultation in early obstetric care. What I always tell my patients is that this nausea, as unpleasant as it may be, is in the vast majority of cases a sign that the pregnancy is progressing normally. My approach is progressive: we start with dietary measures — splitting meals, crackers in the morning, ginger — then vitamin B6 if needed, and finally doxylamine if that fails. In my practice, this stepped approach is enough to relieve over 90% of patients. For the 1 to 3% who develop hyperemesis gravidarum, we have an effective therapeutic arsenal. The most important thing is not to trivialize the suffering: if nausea prevents you from living normally, you must seek help. No woman should endure this alone."

Dr. Elie Servan-Schreiber, physician and founder of bienmangerenceinte.fr