What to know about the symptoms of a dairy intolerance.

06/02/2022

Lactose is a sugar found only in milk. It is also present in dairy products and products made from milk, including cheese and ice cream.

If a person has lactose intolerance, their digestive system produces too little of an enzyme known as lactase. Lactase is needed to break down lactose.

Lactose intolerance is different from a milk allergy. In a milk allergy, the body reacts to milk proteins, not milk sugar. A milk allergy can result in severe symptoms, including anaphylaxis.

Worldwide, 68% of people have trouble digesting lactose.

People with lactose intolerance experience symptoms after eating or drinking milk or dairy products that contain lactose.

Symptoms can range from mild discomfort to a severe reaction. This depends on how much lactase a person’s body produces and how much lactose they consumed.

Most people with lactose intolerance can eat some amount of lactose without experiencing symptoms. Each person has a different tolerance level.

Symptoms of lactose intolerance can include:

  • bloating
  • abdominal pain and cramping
  • flatulence (gas)
  • nausea
  • diarrhoea
  • belching

The person may have a sudden urge to use the bathroom 30 minutes to 2 hours after consuming lactose.

Chronic diarrhoea can lead to dehydration, so it is important for a person to drink plenty of water if they have diarrhoea.