Morning Sickness: Causes, Remedies, and When It Ends

What is morning sickness?

Morning sickness is the nausea and vomiting that many people experience during pregnancy, most commonly in the first trimester. Despite the name, it can happen at any time of day or night. Some people feel mildly queasy, while others are sick multiple times a day. It is one of the most common symptoms of early pregnancy, and while it can be truly miserable, it is almost always temporary.

The medical term is nausea and vomiting of pregnancy (NVP). Around 70-80% of pregnant people experience some degree of nausea, and about 50% also have vomiting. For most, it begins between weeks 5 and 6, peaks around weeks 8 to 10, and gradually eases by week 12 to 14.

What causes morning sickness?

The exact cause is not fully understood, but several factors are thought to contribute.

Rising hCG levels. Human chorionic gonadotropin (hCG) increases rapidly in early pregnancy, doubling roughly every 48 hours. The peak of nausea often coincides with the peak of hCG, around weeks 8 to 10. This is why morning sickness tends to ease as hCG levels plateau in the second trimester.

Progesterone. This hormone relaxes smooth muscle throughout your body, including your digestive tract. The result is slower digestion, which can contribute to nausea, bloating, and acid reflux.

Heightened sense of smell. Many pregnant people report an almost superhuman sensitivity to smells from very early on. Oestrogen is thought to be responsible, and strong odours from cooking, perfume, or everyday environments can trigger waves of nausea.

Evolutionary protection. Some researchers believe morning sickness evolved as a protective mechanism, steering pregnant people away from foods that might contain toxins or pathogens during the critical period of organ formation. This may explain why meat, fish, and strong-flavoured vegetables are among the most common aversions.

When does it start and end?

For most people, nausea begins between weeks 5 and 6 of pregnancy. It typically peaks between weeks 8 and 10, when hCG levels are at their highest.

The good news is that for the majority, symptoms improve significantly by week 12 to 14. By week 16, most people feel noticeably better. However, around 10-20% of pregnant people continue to experience nausea beyond the first trimester, and a small number have symptoms throughout their entire pregnancy.

If your nausea arrives later than expected, or returns after a period of relief, this is not unusual. Every pregnancy is different, and there is a wide range of normal.

Remedies that actually work

There is no single cure for morning sickness, but several strategies have good evidence behind them.

Eat little and often. An empty stomach makes nausea worse. Keep plain crackers, dry toast, or rice cakes by your bed and eat something before you get up in the morning. Aim for small meals every two to three hours rather than three large ones. Bland, carbohydrate-rich foods tend to be the easiest to tolerate.

Stay hydrated. Sip water throughout the day rather than drinking large amounts at once. If plain water is hard to stomach, try adding a slice of lemon, or try ice lollies, diluted squash, or flat lemonade. Dehydration can make nausea worse, so even small sips count.

Ginger. Ginger has genuine evidence supporting its effectiveness against pregnancy nausea. A 2014 systematic review in Nutrition Journal found that ginger significantly reduced nausea compared to placebo. Try ginger tea, ginger biscuits, crystallised ginger, or ginger ale made with real ginger. The NHS lists ginger as a recommended remedy.

Acupressure wristbands. Some people find relief from Sea-Band or similar acupressure wristbands that apply pressure to the P6 (Nei-Kuan) point on the inner wrist. The evidence is mixed, but they are safe, inexpensive, and worth trying.

Rest. Fatigue and nausea feed off each other. When you are exhausted, nausea feels worse. Rest without guilt whenever you can, and accept that your energy levels will be lower than usual during this phase.

Avoid triggers. Pay attention to what makes your nausea worse. Common triggers include strong smells (cooking, perfume, petrol), stuffy rooms, spicy or fatty foods, and hot environments. Open windows, eat cold foods if hot food smells are a problem, and ask others to help with cooking if you can.

Vitamin B6. Some evidence suggests that vitamin B6 (pyridoxine) can help reduce nausea. NICE guidelines note that it may be considered as a first-line treatment. Speak to your midwife or GP before taking any supplements beyond your standard prenatal vitamin.

When to speak to your midwife

Most morning sickness, while unpleasant, is manageable at home. However, you should contact your midwife or GP if you experience any of the following:

You cannot keep any food or fluids down for 24 hours. You have dark-coloured urine or are urinating much less than usual (signs of dehydration). You feel dizzy or faint when standing. You have lost weight. You have a fever or abdominal pain alongside vomiting.

These could be signs of hyperemesis gravidarum (HG), a severe form of pregnancy sickness that affects around 1-3% of pregnancies. HG is a serious medical condition that requires treatment, which may include anti-sickness medication, IV fluids, and in some cases, hospital admission. It is not simply "bad morning sickness," and you should never feel that you need to tough it out.

The NHS offers several safe anti-sickness medications for pregnancy. If over-the-counter remedies are not working, your GP can prescribe medication. There is no need to suffer in silence.

Morning sickness and your baby

It is natural to worry about whether nausea and vomiting might harm your baby. The reassuring answer is that for the vast majority of people, morning sickness does not affect the baby's development. Your baby draws nutrients from your existing stores, and short periods of reduced food intake are unlikely to cause any problems.

In fact, several studies have found a positive association between morning sickness and pregnancy outcomes. A 2016 study published in JAMA Internal Medicine found that nausea and vomiting were associated with a lower risk of pregnancy loss. This does not mean that people who do not experience morning sickness should worry. It simply means that if you are feeling terrible right now, your body is doing something it is supposed to do.

If you can only eat beige carbohydrates for a few weeks, that is perfectly fine. Your prenatal vitamin will help fill any nutritional gaps, and you will be able to eat more varied foods once the nausea passes.

Coping at work

Managing morning sickness at work can be especially difficult, particularly if you have not yet shared your pregnancy news. Some practical tips: keep dry snacks in your desk drawer, identify the nearest bathroom, carry a small toiletry bag with a toothbrush and mints, and step outside for fresh air when you need to.

If your morning sickness is severe enough to affect your work, you are entitled to pregnancy-related sick leave. Under UK employment law, pregnancy-related absence cannot be used against you in disciplinary or redundancy decisions. If you need adjustments at work, your employer has a legal obligation to carry out a risk assessment once they know you are pregnant.

You are not alone

Morning sickness can feel isolating, especially in the first trimester when many people have not yet shared their news. You may be navigating constant nausea while pretending everything is normal at work and in social situations. That takes real strength.

If you are struggling, talk to your partner, a trusted friend, or your midwife. You do not have to push through this alone. And remember: this phase is temporary. For most people, the second trimester brings genuine relief, and the memory of morning sickness fades faster than you might think.