Cow's milk protein allergy: it is not just "diarrhoea"

Typical symptoms

Cow's milk protein allergy is common in infants and young children: diarrhoea, blood-streaked stools, repeated vomiting, worsening eczema, and it can also cause repeated abdominal pain. Symptoms can appear from a few minutes to several days after eating, and are easily mistaken for a "weak stomach".

The difference from lactose intolerance

Lactose intolerance is caused by a lack of the enzyme that digests lactose. It causes bloating, gas and diarrhoea, and does not involve the immune system. Cow's milk protein allergy is an immune reaction. Even a tiny amount can trigger it, and it can affect the skin and airways. The two have different mechanisms and are managed differently.

What to do after diagnosis

For breastfed infants, the mother needs to avoid cow's milk protein under a doctor's guidance. For formula-fed infants, an alternative formula needs to be chosen under a doctor's guidance. During the replacement period, growth and development need to be monitored, and calcium and vitamin D supplemented if necessary.

How long does it last

Most children gradually become tolerant as they grow. Regular assessment under a doctor's guidance is needed. Parents are not advised to test by "trying a small amount" on their own.

This article is for general information only and is not medical advice. Please follow your doctor's instructions.