What is nausea?
Nausea is the uncomfortable sensation that you might be sick (vomit). It can occur on its own or alongside vomiting, and is often accompanied by other feelings such as sweating, increased saliva, or a sense of unease in the stomach. Nausea is not a condition in itself but a symptom that can arise from a huge range of causes.
Most of the time, nausea is short-lived and not a sign of anything serious. However, because it has so many possible causes, persistent or severe nausea, or nausea with certain other symptoms, is worth getting checked.
Common causes
Nausea can come from the digestive system, the inner ear, the brain, or as a response to many other things. Common causes include:
- •Stomach bugs (gastroenteritis) and food poisoning
- •Motion sickness
- •Pregnancy, especially in early months
- •Eating too much, or certain foods
- •Migraines
- •Anxiety or strong emotions
- •Medications, as a side effect
- •Pain, or feeling generally unwell with an infection
How to ease nausea
For everyday nausea, several simple measures often help. These include:
- •Sipping cold, clear fluids slowly to stay hydrated
- •Eating small amounts of plain, bland food, such as crackers or toast
- •Getting fresh air
- •Resting, ideally sitting up rather than lying flat
- •Avoiding strong smells, greasy or spicy foods
- •Ginger, which some people find soothing
When nausea needs attention
Most nausea passes, but some patterns warrant medical advice. Nausea that is persistent, severe, or accompanied by repeated vomiting that prevents you keeping fluids down can lead to dehydration and needs attention. Nausea with severe abdominal pain, a high fever, a severe headache, or signs of dehydration should be checked promptly.
Certain situations always deserve urgent care — for example, nausea with chest pain, confusion, a stiff neck, or vomit that is bloody or looks like coffee grounds. If you are pregnant and unable to keep fluids down, contact your healthcare provider, as severe pregnancy sickness sometimes needs treatment.
Practical ways to settle your stomach
When nausea strikes, several practical measures can help settle your stomach while it passes. Sipping cold, clear fluids slowly — rather than gulping large amounts — helps you stay hydrated without overwhelming the stomach. Small amounts of plain, bland foods such as crackers, dry toast, rice or bananas are often easier to tolerate than rich, greasy or strongly flavoured foods, which can worsen nausea.
Fresh air and rest help many people, and it is generally better to sit upright or recline slightly rather than lying flat, which can worsen nausea, particularly if reflux is involved. Strong smells are a common trigger, so a well-ventilated space and avoiding cooking odours or perfumes can make a difference. Ginger, whether as tea, in food or as a supplement, is a traditional remedy that some research supports for easing nausea.
Distraction, slow breathing and relaxation can also help, especially when nausea is linked to anxiety. If you are losing fluids through vomiting, oral rehydration solutions help replace lost salts and water. The key is to reintroduce food gently as the nausea eases rather than forcing a large meal. If you cannot keep any fluids down or nausea persists, seek medical advice.
Nausea in pregnancy and motion sickness
Two particularly common situations deserve a mention, as they affect many people. Nausea in pregnancy, often called morning sickness despite occurring at any time of day, is very common in early pregnancy, usually easing after the first trimester. For most women it is unpleasant but not harmful, and small, frequent bland meals, staying hydrated and ginger can help. However, severe pregnancy sickness that prevents keeping fluids down (hyperemesis gravidarum) needs medical care.
Motion sickness, triggered by travel in cars, boats, planes or trains, results from a mismatch between what the eyes see and what the inner ear senses about movement. It can often be reduced by looking at the horizon or a fixed point, sitting where motion is felt least (such as the front of a car or over the wing of a plane), getting fresh air, and avoiding reading. Various remedies, including over-the-counter medicines, can help prevent it.
In both cases, simple measures are usually enough, but it is worth seeking advice if nausea is severe, persistent, or stopping you from keeping fluids down. For pregnancy in particular, a healthcare provider can offer safe, effective treatments when sickness is significantly affecting wellbeing.
What your nausea might be telling you
Because nausea is a symptom rather than a condition in itself, the circumstances around it often give clues to the cause, which can guide how to respond. Nausea that comes on shortly after eating, particularly with certain foods, may relate to the digestive system or something that disagreed with you. Nausea accompanied by diarrhoea and tummy cramps often points to a stomach bug or food poisoning, which usually settles on its own with rest and fluids.
Nausea linked to movement, such as in a car or boat, indicates motion sickness, while nausea that comes with a severe one-sided headache and light sensitivity may be part of a migraine. Nausea on standing or with dizziness can relate to blood pressure, and nausea that appears with anxiety or stressful situations may be driven by the strong gut-brain connection. In women of reproductive age, persistent nausea, especially in the morning, can be an early sign of pregnancy.
While these patterns can be helpful, they are not a substitute for medical assessment when nausea is severe, persistent, or accompanied by warning signs such as severe abdominal pain, a high fever, a severe headache, chest pain, confusion, or vomiting blood. In those situations, the priority is to seek medical help rather than trying to interpret the cause yourself.