What Is the Most Common Cause of Abdominal Pain in Children?

Abdominal pain in children is common and is usually caused by a temporary digestive problem. Constipation is one of the most common identifiable causes, particularly when the pain comes and goes and is accompanied by hard, painful or infrequent stools.

However, the cause can differ depending on how suddenly the pain started, how long it has continued and whether the child has other symptoms.

Functional abdominal pain is also common in children who experience repeated pain for several weeks or months. The pain is real, but medical tests may not show infection, inflammation or structural damage in the digestive system.

How Does Constipation Cause Abdominal Pain?

When stool remains in the intestine for too long, it becomes hard and difficult to pass. The accumulated stool can stretch the bowel and cause pain, pressure, gas or abdominal bloating.

Signs that abdominal pain may be related to constipation include:

• Hard, dry or pellet-like stools

• Fewer bowel movements than usual

• Pain or straining while passing stool

• A swollen or bloated abdomen

• Reduced appetite

• Pain that improves after passing stool

• Stool marks or leakage in the underwear

• Avoiding or holding bowel movements

Some children hold their stool because they previously experienced a painful bowel movement, do not want to use a school toilet or are too busy playing. Regular stool withholding can make constipation and abdominal pain worse.

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Other Common Causes of Abdominal Pain in Children

Not every stomach ache is caused by constipation. The child’s age, pain location, duration and accompanying symptoms can help identify the possible cause.

Gastroenteritis

A viral or bacterial infection of the stomach or intestines can cause abdominal cramps along with diarrhoea, vomiting, nausea, fever or reduced appetite.

Preventing dehydration is particularly important when vomiting and diarrhoea occur together.

Gas and Indigestion

Eating too quickly, overeating, swallowing air or consuming certain foods may cause temporary gas, bloating and abdominal discomfort.

Gas-related pain usually improves after the child burps, passes gas or has a bowel movement. Frequent or severe pain should not automatically be blamed on gas.

Functional Abdominal Pain

Functional abdominal pain commonly causes repeated discomfort around the belly button. It may be associated with increased digestive sensitivity, stress or changes in communication between the brain and digestive system.

The pain is genuine even when medical examinations do not identify inflammation, infection or structural disease.

Food Intolerance

Some children experience abdominal pain, gas, bloating or loose stools after consuming particular foods.

Lactose intolerance is one possible cause, but similar symptoms may occur with other digestive conditions. Parents should not remove milk, gluten or other important food groups from a child’s diet without professional advice.

Urinary Tract Infection

A urinary tract infection may cause lower abdominal pain, fever, frequent urination, bedwetting or pain while passing urine.

A urine test may be required when abdominal pain is accompanied by urinary symptoms.

Appendicitis

Appendicitis is less common than constipation or gastroenteritis, but it requires urgent medical assessment.

The pain may begin around the belly button and later move towards the lower-right side of the abdomen. It may become worse with walking, coughing or movement and may occur with vomiting, fever or loss of appetite.

When Should Parents Consult a Doctor?

Consult a doctor when abdominal pain:

• Keeps returning or affects school, sleep or regular activities

• Continues for more than a day

• Regularly occurs with constipation, diarrhoea or vomiting

• Is associated with poor appetite, weight loss or poor growth

• Wakes the child from sleep

• Does not improve after passing stool

• Occurs with pain or difficulty while urinating

• Becomes more frequent or severe

Repeated abdominal pain should be properly evaluated rather than repeatedly treated with digestive medicines or home remedies.

When Is Abdominal Pain in a Child an Emergency?

Seek urgent medical care when the child has:

• Severe or rapidly worsening abdominal pain

• A very swollen, hard or tender abdomen

• Green vomit

• Blood in the vomit or stool

• Persistent pain in the lower-right abdomen

• Difficulty walking or standing because of the pain

• Repeated vomiting

• An inability to retain fluids

• Unusual sleepiness or weakness

• Reduced urination or other signs of dehydration

• Abdominal pain following an injury

Parents should not assume that every stomach ache is caused by gas or constipation when warning signs are present.

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What Can Parents Do at Home?

For mild abdominal pain without warning signs, parents can:

• Encourage the child to drink sufficient water

• Maintain regular meal and toilet routines

• Offer a balanced diet containing fruits, vegetables and whole grains

• Encourage age-appropriate physical activity

• Observe stool frequency and appearance

• Record when the pain occurs

• Note any connection with food, bowel movements, school or stressful situations

• Allow the child to rest

Parents should avoid giving laxatives, antibiotics, pain medicines or digestive remedies without advice from a qualified healthcare professional. Treatment should be based on the child’s age, symptoms and the underlying cause of the pain.

How Is Recurrent Abdominal Pain Evaluated?

The doctor may ask about the location, duration and pattern of the pain. The child’s bowel habits, diet, vomiting, urinary symptoms, growth and family medical history may also be reviewed.

The abdomen may be examined for tenderness, swelling, retained stool, lumps or enlargement of internal organs.

Depending on the child’s symptoms, investigations may include:

• Growth and nutritional assessment

• Blood tests

• Stool examination

• Urine test

• Abdominal ultrasound

• Abdominal X-ray

• Tests for coeliac disease

• Other gastrointestinal investigations

Not every child requires every test. Investigations are selected according to the child’s symptoms and clinical examination.

Specialist Evaluation for Abdominal Pain in Children

Children with persistent or repeatedly returning abdominal pain may require evaluation by a pediatric gastroenterologist, especially when the pain occurs with constipation, vomiting, diarrhoea, bloating, poor appetite, weight loss or delayed growth.

Dr. Nidhi Saini, DNB, PDCC in Pediatric Gastroenterology, evaluates gastrointestinal and liver-related conditions affecting infants, children and adolescents at Sanidhya Clinic in Vadodara.

For children with recurrent abdominal pain, her assessment focuses on understanding the pain pattern, bowel habits, food-related symptoms, growth and warning signs. This helps determine whether the pain may be related to constipation, functional abdominal pain, food intolerance, coeliac disease, infection or another digestive condition.

Parents can also receive guidance on whether dietary changes, medicines or further investigations are genuinely required.

Concerned About Your Child’s Abdominal Pain?

Repeated abdominal pain should not be ignored or treated only with home remedies. A specialist evaluation can help identify whether the pain is related to constipation, functional abdominal pain, food intolerance, infection or another digestive condition.

Frequently Asked Questions

What is the most common cause of abdominal pain in children?

Constipation is one of the most common identifiable causes. In children with long-lasting or repeatedly returning pain, functional abdominal pain is also common.

How can I tell whether my child’s stomach pain is caused by constipation?

Look for hard or painful stools, fewer bowel movements, straining, bloating, stool withholding or pain that improves after passing stool.

Can gas cause severe stomach pain in children?

Gas can cause cramping, bloating and temporary discomfort. However, severe, persistent or localised pain should not automatically be blamed on gas and may require medical assessment.

Can stress cause abdominal pain in children?

Yes. Stress and anxiety can affect communication between the brain and digestive system, causing or worsening functional abdominal pain. The pain is real and should not be dismissed.

Can food intolerance cause abdominal pain?

Yes. Food intolerance may cause pain, gas, bloating or diarrhoea after eating certain foods. A medical evaluation may be needed before removing important food groups from the child’s diet.

What should I give my child for abdominal pain?

The correct treatment depends on the underlying cause. Encourage fluids and observe the child’s symptoms, but avoid giving laxatives, antibiotics or other medicines without medical advice.

When is abdominal pain in a child an emergency?

Seek urgent care for severe or worsening pain, green vomit, blood in the vomit or stool, a swollen and tender abdomen, repeated vomiting, dehydration or pain moving towards the lower-right abdomen.

Which doctor treats repeated abdominal pain in children?

A pediatrician can assess the initial symptoms. A pediatric gastroenterologist may be recommended when the pain keeps returning or occurs with persistent constipation, vomiting, diarrhoea, poor growth or other digestive symptoms.