Feeling sick in early pregnancy is extremely common, and for most people it settles down well before halfway through the pregnancy. That doesn't make it easy to live with in the meantime: nausea that follows you through the working day, or vomiting that leaves you exhausted, can be genuinely hard going, especially when the name "morning sickness" doesn't match what you're actually experiencing.
This guide covers why pregnancy sickness happens, the self-care measures that help most people, what a pharmacist or GP can offer when self-care isn't enough, and the warning signs of hyperemesis gravidarum, the more severe form that needs prompt medical attention.
What causes morning sickness and when it starts
Nausea and vomiting in pregnancy is thought to be linked to the rapid rise in pregnancy hormones, particularly human chorionic gonadotropin (hCG) and oestrogen, in the first trimester. It isn't fully understood why some people are affected far more than others, but a previous pregnancy with sickness, a family history of it, and carrying twins or more are all associated with a higher chance of it happening again.
Symptoms usually begin around 4 to 6 weeks of pregnancy, often peak by around 9 weeks, and ease for most people by 12 to 16 weeks. A smaller number of women continue to feel sick, on and off, later into pregnancy or throughout. Despite the name, morning sickness can strike at any time of day, and plenty of people find it worse in the evening or triggered unpredictably by particular smells, tastes or an empty stomach.
It's worth knowing that nausea and vomiting in pregnancy is not a sign that anything is wrong with the pregnancy. In fact, some research has linked its presence to a slightly lower chance of miscarriage, which can be reassuring even though it doesn't make the symptoms any more pleasant to live with.
Self-care and lifestyle measures that help
For most people, simple changes to eating and daily routine make a real difference before any medicine is needed:
- eat small amounts often rather than three large meals, and try something plain and dry, such as a cracker, before getting out of bed
- avoid foods, smells or situations that you notice trigger nausea, which vary a lot from person to person
- sip fluids regularly through the day rather than drinking a large amount at once, and try cold or fizzy drinks if plain water doesn't sit well
- rest when you can and avoid getting overtired, since fatigue tends to make nausea worse
- try ginger, as tea, biscuits or a supplement at normal food-level doses, which some people find helpful
- consider acupressure wristbands, which some women find useful, even though the evidence for how well they work is limited
Prenatal vitamins containing iron can sometimes make nausea worse; if this applies to you, a pharmacist or midwife can suggest a better-tolerated alternative rather than you stopping supplements altogether. None of these measures will work for everyone, and that's not a reflection of anything you're doing wrong: some pregnancies simply come with more sickness than others.
When self-care isn't enough: pharmacy and prescription options
If nausea and vomiting are affecting your ability to eat, drink, work or look after yourself despite trying self-care measures, it's time to speak to a pharmacist, GP or midwife rather than struggling on. A number of anti-sickness medicines are considered suitable in pregnancy, and treating troublesome symptoms early tends to work better than waiting until things become severe.
Xonvea is a licensed combination of doxylamine (an antihistamine) and pyridoxine (vitamin B6), specifically approved for treating nausea and vomiting of pregnancy when dietary and lifestyle changes haven't given enough relief. Other antihistamine-based antiemetics are also commonly used and have a long track record of safe use in pregnancy. Your pharmacist or GP will consider your symptoms, how far along you are, and anything else about your health before recommending an option.
If tablets aren't tolerated because vomiting is too frequent, or symptoms don't settle with a first medicine, your GP or midwife can consider other options, including anti-sickness medicines given in different forms. This is a step-by-step process, and there's no need to feel you have to push through severe symptoms before asking for help.
Hyperemesis gravidarum: when sickness becomes something more
Hyperemesis gravidarum is the medical name for severe, persistent nausea and vomiting in pregnancy. It's more intense and longer-lasting than typical morning sickness, and it stops you keeping enough food or fluids down, which can lead to dehydration, weight loss and an imbalance of essential salts in the body. It affects a small proportion of pregnancies, but when it happens it usually needs proper medical treatment rather than self-care alone.
Signs that point towards hyperemesis gravidarum, rather than typical pregnancy sickness, include vomiting many times a day, being unable to keep any food or fluids down, losing weight, feeling very weak, dizzy or faint, and passing much less urine than usual or urine that looks dark. Left untreated, it can affect both your wellbeing and, in more severe cases, the pregnancy, so early assessment matters.
Treatment usually starts with anti-sickness medicine, and if dehydration has already set in, a short hospital admission for intravenous fluids and monitoring may be needed. Many women with hyperemesis gravidarum go on to have straightforward, healthy pregnancies once symptoms are brought under control, and support is available throughout, including from specialist pregnancy sickness charities as well as your midwifery team.
Is it safe to take anti-sickness medicine in pregnancy?
It's a completely understandable worry: most people want to avoid taking anything unnecessary while pregnant. The medicines pharmacists and doctors offer for nausea and vomiting of pregnancy, such as Xonvea and the antihistamine-based antiemetics used alongside or instead of it, have been used in pregnancy for a long time and are prescribed specifically because their safety profile in pregnancy is well established.
The decision to treat is always a balance: untreated severe nausea and vomiting can itself affect your nutrition, hydration, wellbeing and ability to function, and that has to be weighed against any medicine's own profile. This is exactly the kind of judgement a pharmacist, GP or midwife is trained to help you make, taking into account how severe your symptoms are, how far along you are, and your wider health. What is never a good approach is taking a leftover anti-sickness medicine from a previous illness or a friend's cupboard without checking it's appropriate for pregnancy first.
When to see a doctor or midwife
Mention ongoing nausea or vomiting to your midwife or GP at your next routine appointment if self-care measures aren't keeping things manageable. Don't wait for a scheduled appointment, though, and seek advice the same day if you cannot keep any food or fluids down for 24 hours, you're losing weight, you feel very dizzy, weak or faint, your heart is racing, you're passing very little urine or it looks dark, you have abdominal pain or a fever, or you notice blood when you vomit.
These can be signs of hyperemesis gravidarum or, occasionally, another cause of vomiting that needs to be ruled out, so it's always worth getting checked rather than assuming it will pass. If you're ever unsure how urgently you need to be seen, call your midwife, GP surgery or NHS 111 for guidance; you don't need to have a certain number of "bad" symptoms before it's reasonable to ask for help.