Vomiting in children

Overview

Vomiting in children is when a child's stomach contents are forcefully ejected through the mouth. It is often the body's way of getting rid of something harmful, like a virus or spoiled food. Most episodes are short-lived and not serious.

Yes, vomiting is very common in children, especially under the age of 5. Most children will have at least one episode of vomiting before they start school.

Vomiting can affect children of any age, but babies, toddlers, and young children are more likely to become dehydrated quickly. Children with weakened immune systems or chronic health conditions may need extra care.

Symptoms

Common symptoms

• Nausea (feeling sick to the stomach)
• Retching (trying to vomit without anything coming up)
• Forceful vomiting of stomach contents
• Stomach cramps or mild pain
• Loss of appetite

Symptoms in children

• Frequent vomiting – especially if the child cannot keep any fluids down for more than 8–12 hours
• Signs of dehydration: dry mouth, no tears when crying, sunken eyes, fewer wet nappies or not urinating for 6–8 hours
• Fussiness, crying, or unusual drowsiness
• Refusing to drink or breastfeed

Symptoms in older adults

• This section is not applicable to children.

Causes

Main causes

• Gastroenteritis (stomach flu) – usually caused by a virus like rotavirus or norovirus
• Food poisoning from bacteria or toxins in spoiled food
• Infections outside the stomach, like a urinary tract infection, ear infection, or pneumonia
• Motion sickness from cars, boats, or swings
• Overeating or food allergies
• Migraines (a type of headache) can sometimes cause vomiting in children
• Rarely, more serious conditions like appendicitis or a blocked intestine

Risk factors

• Young age (under 5 years) – immune system is still developing
• Being around other sick children (e.g., at daycare or school)
• Weakened immune system due to illness or medications
• Travel or changes in routine that increase exposure to new germs
• Not being vaccinated against rotavirus (a common cause of vomiting and diarrhea in babies)

When to see a doctor

See a doctor urgently if:

• Your child cannot keep any fluids down for more than 24 hours (or 12 hours for babies)
• There is blood or green bile in the vomit
• Your child has severe abdominal pain, especially if it is constant or on the right side
• Your child has signs of dehydration: no urine for 6–8 hours, dry mouth, no tears, sunken eyes, or unusual drowsiness
• Vomiting after a head injury

Book a routine appointment if:

• Vomiting that lasts more than 2–3 days without getting better
• Your child has mild vomiting but is still drinking, wetting nappies or urinating, and is generally well
• You are worried or unsure what to do – it is always okay to get advice

Diagnosis

A doctor will ask about your child's symptoms, when the vomiting started, how often, and whether there are other signs like fever or diarrhea. They will also ask about recent travel, food, and contact with sick people. A physical examination will check for signs of dehydration and other causes.

Tests that may be done

• Usually no tests are needed – the diagnosis is based on symptoms and examination.
• If dehydration is severe, the doctor may order a blood test to check electrolytes (minerals in the blood).
• A urine sample may be taken to look for a urinary tract infection.
• In rare cases, if a blockage or other serious problem is suspected, an X-ray or ultrasound of the abdomen may be done.

What to expect at your appointment

The doctor will explain whether the vomiting is likely due to a common infection and give advice on fluid management. They may recommend giving oral rehydration solution (a special drink with the right balance of sugar and salts). If your child is dehydrated, they might need fluids through a tube in the vein (IV) for a few hours. Most children are sent home to recover with clear instructions on what to watch for.

Treatment

The main treatment for vomiting in children is to prevent dehydration and let the stomach settle. Medication is rarely needed. In most cases, the vomiting stops on its own within 24–48 hours as the body fights off the infection.

Self-care at home

• Stop solid foods for a few hours and give only small, frequent sips of clear fluids (e.g., water, breast milk, or oral rehydration solution).
• Start with 5–10 ml (one teaspoon) every 5–10 minutes, then slowly increase as tolerated.
• If using oral rehydration solution, follow the instructions on the packet – do not add extra water or sugar.
• Avoid giving plain water only to infants under 6 months – use breast milk or formula, or rehydration solution.
• Do not give anti-nausea or anti-vomiting medicines without a doctor’s advice – they are rarely used in children and can have side effects.
• Return to a normal diet gradually when vomiting has stopped and your child is hungry – start with bland foods like crackers, toast, rice, or bananas.
• Keep your child resting and make sure they are comfortable. Wash hands frequently to stop the spread of infection.

Medical treatments

In a hospital, if a child is severely dehydrated, doctors may give fluids through a drip (intravenous line) to rehydrate them quickly. Sometimes, if vomiting is very persistent and not caused by a serious condition, a doctor may prescribe an antiemetic (medicine to stop vomiting) for a short period. This is only done in certain cases and always under medical supervision. Antibiotics are not given for viral infections.

When is surgery considered?

Surgery is not needed for most cases of vomiting. If vomiting is caused by a surgical condition such as appendicitis or a bowel obstruction, surgery may be required. Your doctor will explain this if it applies to your child.

Living with this condition

Most children recover from vomiting within a day or two at home. The key is to stay calm, offer fluids often, and watch for dehydration. Your child may be tired and irritable – that is normal. Clean up vomit promptly and wash your hands thoroughly to avoid spreading germs to others.

Lifestyle tips

• Keep your child home from school or daycare until they have not vomited for 24 hours and feel well enough to participate.
• Encourage rest – the body needs energy to fight off infection.
• Avoid giving high-sugar drinks, fizzy drinks, or very cold drinks as they can irritate the stomach.
• If motion sickness is a trigger, avoid long car rides or provide distractions like looking at the horizon.

Diet and exercise

During vomiting, avoid solid foods until the stomach settles. Start with clear fluids, then gradually introduce bland, easy-to-digest foods. Do not force feed. Once vomiting stops, a normal balanced diet can be resumed. Light activity can resume when your child feels better – there is no need for bed rest beyond allowing the child to rest as needed.

Mental health and emotional wellbeing

Vomiting episodes can be frightening for both the child and the parent. The child may feel scared or embarrassed, especially if vomiting happens in public. Reassure your child, offer comfort, and explain that it is the body’s way of getting better. If you feel anxious, it is normal – talk to your healthcare provider or a support person.

Prevention

Not all vomiting can be prevented, but you can reduce the risk by practicing good hygiene: wash hands thoroughly after using the toilet, changing nappies, and before preparing food. Keep your child away from people who are sick with vomiting or diarrhea. Vaccines can prevent some causes of vomiting.

Vaccines

The rotavirus vaccine is given to babies as part of routine childhood immunisations in many countries (including the UK). This vaccine helps prevent a common cause of severe vomiting and diarrhea in infants and young children.

Screening programmes

There is no routine screening for vomiting. Early recognition of symptoms and seeking medical advice when needed is the best approach.

Complications

If left untreated

• Dehydration – the most common complication. It can lead to dry mouth, low urine output, and in severe cases, confusion or kidney problems.
• Electrolyte imbalances – loss of important minerals like potassium and sodium can affect heart and nerve function.
• Weight loss or malnutrition if vomiting continues for a long time.
• Aspiration – breathing in vomit into the lungs, which can cause pneumonia (rare but serious).

Long-term outlook

The outlook for most children with vomiting is excellent. Even without treatment, most cases improve within 24–48 hours as the body clears the infection. With proper home care – especially keeping up with fluids – serious complications are rare. If your child needs hospital care for dehydration, they usually recover fully and go home within a day or two. There are no long-term effects for the vast majority of children.

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