Lactose intolerance living in children

Overview

Lactose intolerance means your child's body has trouble digesting lactose, a natural sugar found in milk and dairy products. When they eat or drink something with lactose, they may get stomach pain, bloating, gas, or diarrhea. It is not an allergy — it is a digestive issue.

Yes, lactose intolerance is fairly common in children worldwide. It is more common in children of Asian, African, Hispanic, and Southern European descent.

It affects children of all ages, but it often starts after age 2 or 3. It can also happen temporarily after a stomach infection or as a result of certain medical conditions.

Symptoms

Common symptoms

• Stomach pain or cramps
• Bloating and gas
• Diarrhea
• Nausea
• Rumbling stomach sounds

Symptoms in children

• Fussiness or irritability after eating dairy
• Refusal to eat or drink milk products
• Stomach pain that comes and goes
• Loose, watery stools
• Gas that smells worse than usual

Symptoms in older adults

• Lactose intolerance can start at any age, but in older adults it may be linked to changes in digestion or other health conditions.

Causes

Main causes

• The body does not make enough lactase, the enzyme that breaks down lactose in the small intestine.
• Temporary lactose intolerance after a stomach infection (gastroenteritis) or gut inflammation.
• Genetic lactose intolerance, which runs in families and is more common in certain ethnic groups.

Risk factors

• Family history of lactose intolerance
• Being of Asian, African, Hispanic, or Southern European descent
• Premature birth (babies born early may have less lactase)
• Conditions like celiac disease or Crohn's disease that affect the small intestine

When to see a doctor

See a doctor urgently if:

• Your child has severe stomach pain or blood in their stool.
• Your child shows signs of serious dehydration (dry mouth, no tears, very dark urine, or unusual sleepiness).
• Your child is vomiting repeatedly and cannot keep fluids down.

Book a routine appointment if:

• Your child has ongoing stomach upset or diarrhea after eating dairy.
• You are worried about your child's growth or weight gain.
• Your child has symptoms that last more than a week.

Diagnosis

Doctors usually diagnose lactose intolerance by talking with you about your child's symptoms and diet. They may also do simple tests to check how the body handles lactose.

Tests that may be done

• Breath test: Your child drinks a lactose drink and then breathes into a bag to measure hydrogen levels.
• Stool acidity test: A stool sample is tested for acid that can happen when lactose is not digested.
• Elimination diet: Removing all dairy from the diet for a week or two to see if symptoms improve.

What to expect at your appointment

Your doctor will ask about your child's symptoms, when they happen, and what foods seem to trigger them. They may also check for other conditions like milk allergy or celiac disease. The tests are simple and usually not painful.

Treatment

Treatment focuses on managing symptoms by adjusting your child's diet. Most children can still eat some dairy without problems. There are also lactase enzyme products that can help digest lactose, but you should always ask your doctor or pharmacist before using them.

Self-care at home

• Keep a food diary to track which dairy foods cause symptoms.
• Try smaller amounts of dairy at a time — many children can handle up to 1 cup of milk per day.
• Choose lactose-free or low-lactose dairy products like hard cheeses and yogurt.
• Offer dairy with other foods to slow digestion and reduce symptoms.
• Make sure your child gets enough calcium from other sources like fortified plant milks, leafy greens, and calcium supplements if needed.

Medical treatments

For some children, doctors may recommend lactase enzyme drops or tablets that can be taken with dairy to help digest lactose. Always talk to your child's doctor before giving any supplement.

When is surgery considered?

Surgery is not used to treat lactose intolerance.

Living with this condition

Living with lactose intolerance means learning which dairy foods your child can enjoy and in what amounts. Many children tolerate yogurt, hard cheese, and small amounts of milk. With a little planning, your child can eat a balanced diet and still join in at parties and meals.

Lifestyle tips

• Read food labels for hidden lactose in breads, cereals, salad dressings, and processed foods.
• Carry lactose-free snacks for your child when away from home.
• Talk to teachers and caregivers so they understand your child's needs.
• Encourage your child to be open about their condition with friends.

Diet and exercise

Your child should eat a variety of foods to get enough calcium, vitamin D, and other nutrients. Good calcium sources include lactose-free milk, fortified plant milks (like soy or almond), tofu made with calcium, broccoli, and canned fish with bones. Exercise is safe and healthy — just make sure your child stays hydrated, especially if they have diarrhea.

Mental health and emotional wellbeing

Some children may feel left out at snack time or embarrassed about their symptoms. It can help to talk about their feelings and remind them that lactose intolerance is common and manageable. If your child seems very upset or avoids social eating, talk to your doctor or a school counselor.

Prevention

Lactose intolerance cannot always be prevented, especially if it is genetic. But you can reduce your child's risk of temporary lactose intolerance by treating stomach infections quickly and managing any underlying gut conditions.

Screening programmes

There is no routine screening for lactose intolerance. Testing is only done if your child has symptoms.

Complications

If left untreated

• Poor growth or weight gain if dairy is not replaced with other calcium-rich foods.
• Weak bones (rickets) if calcium and vitamin D intake is too low over a long time.
• Ongoing stomach pain and discomfort that affects daily life.

Long-term outlook

The outlook for children with lactose intolerance is very good. Most children can manage their symptoms with simple diet changes and live healthy, active lives. Many even find that they can tolerate some dairy without problems. With the right support, your child can thrive.

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