Also known as: Lactose Malabsorption / Lactose Intolerance
Lactose intolerance is a common digestive condition in which the body cannot fully digest lactose, the sugar found in milk and dairy products, leading to bloating, gas, and diarrhoea after consumption.
Lactose intolerance is extremely common, affecting an estimated 68% of the world's population to some degree. Prevalence varies dramatically by ethnicity — over 90% in some East Asian populations versus less than 10% in Northern Europeans.
The condition occurs when the small intestine produces insufficient lactase, the enzyme needed to break down lactose. Undigested lactose passes to the large intestine where bacteria ferment it, producing gas, bloating, and osmotic diarrhoea.
Most people with lactose intolerance can tolerate small amounts of dairy. The condition is easily managed through dietary modification, lactase supplements, or choosing lactose-free alternatives.
People with Lactose Intolerance often experience the following symptoms.
A feeling of fullness, tightness, or distension in the abdomen, typically occurring 30 minutes to 2 hours after consuming dairy products.
Excessive gas production from bacterial fermentation of undigested lactose in the large intestine.
Watery, loose stools caused by unabsorbed lactose drawing water into the intestinal lumen.
Intermittent, crampy pain in the lower abdomen, caused by intestinal distension from gas and fluid accumulation.
Certain factors may increase your likelihood of developing Lactose Intolerance.
Common approaches to managing lactose intolerance. Always consult a healthcare provider for personalized treatment.
Reducing or eliminating high-lactose foods (milk, soft cheeses, ice cream) while retaining tolerated amounts. Hard cheeses and yoghurt are often better tolerated.
Over-the-counter lactase enzyme tablets taken before eating dairy can help digest lactose and prevent symptoms.
Commercially available lactose-free milk and dairy products have lactase pre-added to break down the lactose.
If dairy intake is significantly reduced, supplements may be needed to meet calcium and vitamin D requirements.
Diagnosis may involve a hydrogen breath test (elevated hydrogen after lactose ingestion), lactose tolerance test (blood glucose fails to rise after lactose), or an elimination diet. Genetic testing for lactase persistence can also be used.
See a doctor if symptoms are severe, if you are losing weight, or if you suspect your child may be lactose intolerant and is not growing well.
Steps that may help reduce the risk of developing or worsening lactose intolerance.
No prevention for primary lactose intolerance
Gradual dairy introduction may improve tolerance
Treating underlying gut conditions may resolve secondary intolerance
Consuming dairy with other foods may reduce symptoms
If left untreated or poorly managed, lactose intolerance may lead to:
No. Lactose intolerance is a digestive enzyme deficiency, while a milk allergy is an immune reaction to milk proteins. Milk allergy can be life-threatening; lactose intolerance causes discomfort but is not dangerous.
Yes, it is very common for lactase production to naturally decline with age. Many adults who could drink milk as children develop symptoms later, particularly after age 20.
Most people with lactose intolerance can tolerate some dairy. Hard cheeses, yoghurt, and butter typically contain very little lactose. Starting with small amounts and gradually increasing can help determine your threshold.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.