Morning Sickness: What Actually Helps

What is happening, and how long it lasts

Nausea and vomiting of pregnancy is extremely common, and the NHS describes it as "very common in early pregnancy". The RCOG puts onset typically between the 4th and 7th weeks, and reports that it settles by 20 weeks in 9 out of 10 pregnant women. The NHS says it usually clears by weeks 16 to 20 and "does not put your baby at any increased risk".

Despite the name, it happens at any time of day or night — the NHS notes you may feel sick all day long.

One honest note before the treatments: no source we can point to explains precisely why it happens. Be wary of any article that gives you a confident single-hormone explanation, because the guidance bodies do not.

What actually helps — sorted by strength of evidence

This is the section most articles get wrong, so it is worth being explicit about which tier each option sits in.

Tier 1: Real evidence — prescription anti-sickness medicine

This is the strongest-supported category, and the one people are most reluctant to ask about.

Pregnancy Sickness Support summarises the trial base: for the antihistamines cyclizine and promethazine, "data from 7 randomised controlled trials indicate that these antihistamines are effective in the treatment of nausea and vomiting in pregnancy," and prochlorperazine "was found to be effective for nausea and vomiting in pregnancy in 3 randomised controlled trials." The NHS confirms that where an anti-sickness medicine is offered, it will often be a type of antihistamine.

The 2010 Cochrane analysis also found hydroxyzine, an antihistamine, clearly favoured over placebo (risk ratio 0.23, 95% confidence interval 0.15 to 0.36).

A doxylamine-pyridoxine combination (Xonvea) is, per the RCOG, the only licensed treatment for pregnancy sickness in the UK. Licensing is a regulatory status rather than a measure of how well it works, so treat it as "approved for this use", not "the most effective option".

Other medicines used when first-line options are not enough include metoclopramide, domperidone and ondansetron, and corticosteroids in severe cases.

Tier 2: Weak or inconsistent evidence — ginger and vitamin B6

Both are recommended everywhere online. The evidence is thinner than the enthusiasm.

Ginger. Cochrane's conclusion: "The use of ginger products may be helpful to women, but the evidence of effectiveness was limited and not consistent." Compared head-to-head with vitamin B6 across four studies and 624 women, there was no statistically significant difference. The NHS still lists ginger-containing foods and drinks among self-help measures, but advises checking with a pharmacist before taking ginger supplements.

Important update: Pregnancy Sickness Support reports that the RCOG's 2024 guideline now discourages ginger for people with hyperemesis gravidarum. The RCOG's own patient leaflet does not mention ginger at all.

Vitamin B6 (pyridoxine). Cochrane found results favoured B6 for reducing nausea after three days (mean difference 0.92, 95% CI 0.40 to 1.44), but there was no strong evidence it reduced vomiting. In the separate Cochrane review of hyperemesis treatments, B6 was associated with slightly longer hospital stays than placebo. No authoritative source we could verify publishes a specific milligram dose for self-treatment, so this is one to discuss with a pharmacist or doctor rather than self-prescribe.

Tier 3: Not shown to beat placebo — acupressure bands and acupuncture

The NHS says "there's some evidence" that pressure on the wrist may help. The trial data is less encouraging. Cochrane found that across four studies and 408 women, P6 acupressure versus placebo showed no statistically significant effect. For acupuncture, across two studies and 648 women, "none of the results show significant differences."

Wristbands are inexpensive and harmless, so trying one is reasonable. Just do not expect it to work, and do not let it delay asking for medication.

Standard advice with no trial evidence behind it

Dietary measures are universally recommended and almost entirely untested. They are worth trying because they are free and safe, not because they are proven.

• Plain, dry carbohydrate on waking — dry toast or a plain biscuit or cracker before getting up.
• Small amounts more often rather than large meals. The RCOG suggests foods high in carbohydrate and low in fat, such as potato, rice and pasta.
• Cold food, if cooking smells set you off.
• Frequent small sips of fluid rather than a large glass — the NHS suggests sipping little and often, which is easier to keep down than a full glass.
• Rest — tiredness makes nausea worse.

Peppermint tea, soda water, lemon and mint appear on consumer health pages as things some people find helpful. Cochrane's review looked at chamomile, lemon oil and mint oil among its 41 trials and found no basis for recommending any particular intervention. Try them if you like; do not count on them, and do not let them delay effective treatment.

When it is more than morning sickness

Hyperemesis gravidarum is a severe form. The RCOG describes it as sickness "so severe that it stops you from doing your daily activities and you are unable to eat and drink normally", and puts it at up to 3 in 100 pregnant women. The NHS gives around 1 to 3 in every 100. Cochrane's review of hyperemesis treatments notes it is one of the most frequent causes of hospital admission in pregnancy.

Crucially, the NHS notes that "unlike regular pregnancy sickness, HG may not get better by 16 to 20 weeks." If you are being told to wait it out and you are not coping, that is a reason to push, not to wait.

The RCOG describes dehydration as "feeling 'dry' or very thirsty, becoming drowsy or unwell, or your urine changing from a light yellow to a dark yellow or brown colour."

When to call someone

Contact your midwife, doctor or urgent care line if you:

• Cannot keep food or fluids down for 24 hours.
• Have not passed urine for more than 8 hours, or your urine is very dark.
• Feel weak, dizzy or faint when you stand.
• Have tummy pain, or a high temperature of 38°C (100.4°F) or above.
• Vomit blood.
• Are losing weight.

Call your local emergency number (999 in the UK and Ireland, 911 in the US and Canada, 000 in Australia, or 111 in New Zealand) if you become severely unwell, cannot be roused, or collapse. Treatment for hyperemesis may include intravenous fluids given through a drip, anti-sickness medicines, steroids, or a combination.

What actually helps most, in practice

The single most effective thing many people can do is stop treating medication as a last resort. Both Cochrane reviews conclude there is a lack of high-quality evidence for any one intervention — but the interventions with the best available evidence are the prescribed ones, and the ones with the weakest are the ones sold over the counter.

If sickness is affecting your ability to work, eat or function, ask for an anti-sickness medicine by name. Pregnancy Sickness Support notes that prophylactic medication is recommended for people who had hyperemesis in a previous pregnancy — you do not have to wait until you are unwell again.

For support, Pregnancy Sickness Support runs a UK helpline on 0800 055 4361, with peer support and specialist counselling for hyperemesis.