What Causes Ascites in Children?

Ascites is the abnormal buildup of fluid inside a child’s abdomen. As the amount of fluid increases, the abdomen may appear swollen, stretched, tight or unusually large.

Ascites is not a disease by itself. It is usually a sign of an underlying liver, kidney, heart, infectious or nutritional condition that requires medical evaluation. Treatment focuses on identifying and managing the condition responsible for the fluid accumulation.

A swollen abdomen does not always mean that a child has ascites. Gas, constipation, overeating and enlargement of abdominal organs can also cause abdominal distension. A physical examination and abdominal ultrasound are commonly used to determine whether fluid is present.

Quick Summary

Ascites is an abnormal buildup of fluid inside a child’s abdomen. It may be caused by liver, kidney, heart, infectious or nutritional conditions. Symptoms can include abdominal swelling, rapid weight gain, reduced appetite and breathing difficulty. An abdominal ultrasound can confirm the presence of fluid. Treatment depends on the underlying cause.

Rapid swelling, fever, severe pain or breathing difficulty requires urgent medical attention.

What Are the Common Causes of Ascites in Children?

Liver Disease and Portal Hypertension

Liver disease is an important cause of ascites in children. When scarring, inflammation or damage affects the liver, pressure may increase in the blood vessels carrying blood to it.

This condition is known as portal hypertension.

Increased pressure in these blood vessels, together with reduced production of blood proteins such as albumin, can cause fluid to move into the abdominal cavity.

Liver-related ascites may occur with:

• Chronic liver disease

• Cirrhosis

• Biliary atresia

• Autoimmune hepatitis

• Metabolic or genetic liver disorders

• Severe acute liver injury

Children may also experience:

• Yellowing of the skin or eyes

• Dark urine

• Pale stools

• Enlarged veins over the abdomen

• Easy bruising

• Poor growth

• Enlargement of the liver or spleen

Kidney Disease and Nephrotic Syndrome

Kidney conditions such as nephrotic syndrome can cause large amounts of protein to pass into the urine.

When the albumin level in the blood becomes very low, fluid may collect in the abdomen and other parts of the body.

Parents may notice:

• Swelling around the eyes

• Swollen feet, ankles or legs

• Foamy urine

• Reduced urination

• Rapid weight gain caused by fluid retention

• Tiredness or reduced activity

Kidney function tests, urine tests and blood albumin measurements may be required to determine whether the kidneys are contributing to the fluid accumulation.

Heart Conditions

Certain heart conditions can affect normal blood circulation and cause fluid to collect in the abdomen.

Heart-related ascites may occur with:

• Swelling of the legs

• Breathing difficulty

• Poor feeding

• Excessive sweating

• Tiredness

• Reduced activity

• Poor weight gain

A heart evaluation may be recommended when the child’s symptoms or physical examination suggest a circulation-related problem.

Abdominal Infections

Infections affecting the lining of the abdomen may lead to fluid accumulation.

Tuberculosis and bacterial infections are possible causes, although their likelihood depends on the child’s medical history, immune condition and possible exposure.

Ascites accompanied by the following symptoms requires prompt medical attention:

• Fever

• Abdominal pain

• Abdominal tenderness

• Vomiting

• Unusual tiredness

• Reduced activity

• Poor feeding

These symptoms may indicate that the abdominal fluid has become infected or that another serious condition is present.

Low Albumin and Nutritional Conditions

Albumin is a protein that helps keep fluid inside the blood vessels. Severely reduced albumin levels can allow fluid to leak into the abdominal cavity.

Low albumin may result from:

• Liver disease

• Kidney disease

• Severe malnutrition

• Poor protein absorption

• Conditions that cause protein loss through the intestine

Children with low albumin may also develop swelling around the eyes, feet, ankles or legs.

Pancreatic, Lymphatic and Other Conditions

Less common causes of ascites in children include:

• Pancreatic disease

• Injury to the lymphatic system

• Abdominal trauma

• Certain tumours

• Congenital abnormalities

• Urinary system problems

• Bowel conditions

• Metabolic disorders

Newborns may develop ascites because of congenital infections, urinary problems, bowel disorders or metabolic conditions.

The underlying cause cannot be identified only by looking at the child’s abdomen. Medical examination and appropriate testing are required.

What Are the Symptoms of Ascites in Children?

The symptoms depend on how quickly the fluid collects, how much fluid is present and what is causing it.

Parents may notice:

• Increasing abdominal size

• A tight or stretched abdomen

• Rapid or unexplained weight gain

• Abdominal discomfort or pain

• Poor appetite

• Early fullness while eating

• Nausea or vomiting

• Swelling around the eyes, legs or feet

• Shortness of breath

• Reduced activity

• Unusual tiredness

• A flattened or outward-projecting belly button

A large amount of abdominal fluid may press against the stomach and diaphragm. This can cause reduced appetite, early fullness and difficulty breathing.

Associated symptoms may provide clues about the underlying cause.

For example:

• Jaundice, dark urine, pale stools or easy bruising may suggest a liver-related condition.

• Foamy urine and swelling around the eyes may indicate a kidney-related problem.

• Breathing difficulty, sweating and poor feeding may suggest a heart condition.

• Fever, tenderness or severe pain may indicate an infection.

When Does Ascites in a Child Require Urgent Care?

Rapidly increasing abdominal swelling, fever, breathing difficulty or severe abdominal pain requires urgent medical attention.

Seek urgent medical care when abdominal swelling occurs with:

• Breathing difficulty

• Severe or increasing abdominal pain

• Fever with abdominal tenderness

• Repeated vomiting

• Green vomit

• Blood in vomit or stool

• Sudden confusion

• Unusual sleepiness

• Yellowing of the skin or eyes

• Reduced urination

• Rapidly increasing swelling

• Inability to eat or drink

• A very tight or tender abdomen

A child with known liver disease who develops a new fever, abdominal pain or worsening swelling should be assessed promptly. These symptoms may indicate infection or another complication.

Get Urgent Medical Guidance

How Is Ascites in Children Diagnosed?

The doctor will ask when the abdominal swelling began, how quickly it increased and whether the child has other symptoms.

Important associated symptoms may include:

• Abdominal pain

• Fever

• Vomiting

• Jaundice

• Changes in urine

• Swelling elsewhere in the body

• Reduced appetite

• Breathing difficulty

• Poor growth

• Rapid weight gain

The doctor may examine the child’s:

• Abdomen

• Liver and spleen

• Heart

• Breathing

• Blood pressure

• Weight

• Growth

• Nutritional condition

Abdominal Ultrasound

An abdominal ultrasound is commonly used to confirm ascites.

The ultrasound can help the doctor:

• Confirm whether abdominal fluid is present

• Estimate the amount of fluid

• Examine the liver and spleen

• Check the kidneys

• Look for enlargement or abnormalities of abdominal organs

• Assess blood flow when required

Depending on the child’s symptoms and examination findings, additional investigations may include:

• Liver function tests

• Kidney function tests

• Blood albumin level

• Blood-clotting tests

• Complete blood count

• Urine examination

• Tests for infections

• Heart evaluation

• Metabolic investigations

• Genetic investigations

Abdominal Fluid Testing

In some cases, a doctor may remove a small amount of abdominal fluid using a procedure called paracentesis.

The fluid may be tested for:

• Infection

• Protein levels

• Blood cells

• Other findings that can help identify the underlying cause

Not every child requires every test. Investigations are selected according to the child’s age, symptoms, medical history and examination findings.

How Is Ascites in Children Treated?

Treatment focuses on the underlying condition causing the fluid accumulation. Ascites should not be treated only as abdominal swelling.

Depending on the cause and severity, treatment may include:

• Treatment of the underlying liver condition

• Management of kidney disease

• Treatment of a heart condition

• Treatment of an infection

• Carefully planned sodium restriction

• Medicines that help the body remove excess fluid

• Albumin or other supportive treatment

• Antibiotics when an infection is present

• Nutritional support

• Removal of abdominal fluid when swelling is severe

• Management of portal hypertension

• Liver transplantation in selected cases of advanced liver disease

Fluid drainage may be considered when the swelling:

• Causes significant discomfort

• Makes breathing difficult

• Becomes very tense

• Needs to be tested for infection or other abnormalities

Parents should not give water-removing medicines, herbal products or other treatments without medical guidance.

Parents should also avoid starting a highly restricted diet without speaking to a doctor or qualified dietitian. Incorrect treatment may disturb the child’s salt balance, affect kidney function and interfere with growth and nutrition.

Can Ascites Be Prevented?

Ascites cannot always be prevented because it is usually caused by another medical condition.

However, complications may sometimes be reduced through:

• Early diagnosis of liver, kidney or heart conditions

• Regular medical follow-up

• Taking prescribed medicines correctly

• Monitoring the child’s weight and abdominal size

• Following nutritional guidance

• Completing recommended blood and urine tests

• Seeking medical care when swelling suddenly worsens

Children with an existing liver, kidney or heart condition should attend regular follow-up appointments even when they appear well.

Pediatric Ascites and Liver Evaluation at Sanidhya Clinic

Ascites in a child may be related to liver disease, portal hypertension, low albumin, kidney disease, infection or another gastrointestinal condition.

Identifying the underlying cause is essential before deciding on treatment.

Dr. Nidhi Saini, DNB, PDCC in Pediatric Gastroenterology, is a Pediatric Gastroenterologist and Hepatologist in Vadodara. Her specialist training includes the evaluation of gastrointestinal and liver-related conditions affecting newborns, infants, children and adolescents.

At Sanidhya Clinic, Dr. Nidhi Saini evaluates children with:

• Ascites

• Abdominal distension

• Jaundice

• Unexplained liver enlargement

• Unexplained spleen enlargement

• Abnormal liver tests

• Acute liver disease

• Chronic liver disease

• Portal hypertension

• Poor growth associated with digestive or liver conditions

The evaluation is based on the child’s symptoms, growth, physical examination, laboratory results and abdominal imaging.

Children with breathing difficulty, severe abdominal pain, fever, confusion or rapidly increasing swelling should be taken to an emergency department rather than waiting for a routine appointment.

Book a Pediatric Liver Consultation

Concerned About Abdominal Fluid or Swelling?

Persistent or increasing abdominal swelling should not be diagnosed only by its appearance.

Timely medical evaluation can determine whether the child has ascites and identify the liver, kidney, heart, infectious or nutritional condition causing the fluid accumulation.

Early diagnosis and treatment can help relieve symptoms and reduce the risk of serious complications.

Frequently Asked Questions

Is ascites in children serious?

Ascites can indicate an underlying liver, kidney, heart, infectious or nutritional condition. Its seriousness depends on the cause, the amount of fluid and whether complications such as breathing difficulty or infection are present.

How can parents tell the difference between ascites and bloating?

Gas-related bloating often changes during the day and may improve after passing gas or stool. Ascites generally causes persistent or increasing abdominal swelling. A doctor may use an abdominal ultrasound to confirm whether fluid is present.

What is the most common cause of ascites in children?

Chronic liver disease is an important cause of pediatric ascites. Kidney disease, particularly nephrotic syndrome, is another common cause. The likely cause varies according to the child’s age and associated symptoms.

Can kidney problems cause ascites in children?

Yes. Kidney conditions such as nephrotic syndrome can cause protein loss through urine, low blood albumin and fluid accumulation in the abdomen, face, feet or legs.

Can heart conditions cause abdominal fluid in children?

Yes. Certain heart conditions can affect blood circulation and cause fluid to collect in the abdomen. The child may also experience leg swelling, breathing difficulty, poor feeding, tiredness or excessive sweating.

Can ascites in children be cured?

Ascites may improve when its underlying cause is identified and treated. The outcome depends on whether it is caused by a temporary infection, kidney condition, heart problem or advanced liver disease.

What test confirms ascites?

An abdominal ultrasound is commonly used to confirm the presence of fluid. Blood tests, urine tests and sometimes abdominal fluid analysis may then be used to identify the cause.

Does every child with ascites need fluid drainage?

No. Fluid drainage is generally considered when the swelling is severe, affects breathing, causes significant discomfort or when the fluid needs to be tested. The decision is made by the treating specialist.

Can parents reduce their child’s salt intake at home?

Parents should not make major dietary restrictions without medical advice. Children require balanced nutrition for growth, and the appropriate amount of sodium restriction depends on the cause and severity of ascites.

Which doctor treats ascites in children?

A pediatric gastroenterologist or pediatric hepatologist evaluates ascites related to liver, digestive and nutritional conditions. A pediatric kidney specialist or heart specialist may also be involved when required.

When should a child with ascites be taken to the hospital?

Seek immediate medical care if the child has breathing difficulty, severe abdominal pain, fever, repeated vomiting, confusion, reduced urination, jaundice or rapidly increasing abdominal swelling.