Lactose intolerance vs Celiac disease
How to tell Lactose intolerance and Celiac disease apart when a board question makes them look alike.
Lactose intolerance is dairy-triggered osmotic symptoms with normal mucosa; celiac is gluten-triggered immune villous injury.
Side by side
Bloating, cramping, flatulence, and watery osmotic diarrhea after dairy, with normal small-bowel architecture.
Chronic malabsorption with weight loss, iron deficiency, dermatitis herpetiformis, antibody positivity, and villous atrophy after gluten exposure.
Low lactase activity leaves lactose in the lumen, drawing water and being fermented by bacteria.
Immune-mediated response to gluten damages villi and reduces absorptive surface area.
Positive hydrogen breath test or symptom resolution with lactose avoidance supports lactose intolerance.
Anti-tTG, anti-endomysial antibodies, villous atrophy, and crypt hyperplasia support celiac disease.
The trap
Both can cause diarrhea and bloating, but nutrient deficiencies and villous atrophy belong to celiac disease.
The repair move
For food-triggered diarrhea, separate enzyme/osmotic dairy symptoms from immune gluten enteropathy.
Try a free question
CoreA patient develops bloating, cramping, and watery diarrhea after milk. Symptoms improve with lactose avoidance, and there is no anemia, dermatitis, or villous atrophy. Which diagnosis is most likely?
Show answer and explanation
Answer: A. Lactose intolerance. Lactose intolerance is lactase deficiency causing osmotic symptoms after dairy without immune villous injury.
Why the other choices are tempting
- B. Celiac disease causes immune-mediated villous atrophy and nutrient deficiencies.
- C. Tropical sprue causes chronic malabsorption after endemic exposure.
- D. Whipple disease has systemic features and PAS-positive macrophages.
- E. Crohn disease causes transmural inflammation and skip lesions.
Flashcards
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What trigger points to lactose intolerance?
Symptoms tightly following dairy ingestion point to lactose intolerance.
What trigger points to celiac disease?
Gluten exposure with immune markers and malabsorption points to celiac disease.
Quick answers
What is the fastest way to tell Lactose intolerance from Celiac disease?
Lactose intolerance is dairy-triggered osmotic symptoms with normal mucosa; celiac is gluten-triggered immune villous injury.
What is the key clue for Lactose intolerance?
Bloating, cramping, flatulence, and watery osmotic diarrhea after dairy, with normal small-bowel architecture.
What is the key clue for Celiac disease?
Chronic malabsorption with weight loss, iron deficiency, dermatitis herpetiformis, antibody positivity, and villous atrophy after gluten exposure.
What is the common trap with Lactose intolerance vs Celiac disease?
Both can cause diarrhea and bloating, but nutrient deficiencies and villous atrophy belong to celiac disease.