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Irritable Bowel Syndrome I: Introduction01:17

Irritable Bowel Syndrome I: Introduction

Irritable Bowel Syndrome (IBS) is characterized by functional disturbances in the gastrointestinal system, presenting a cluster of symptoms without evident structural or biochemical abnormalities. It primarily affects the large intestine and may cause abdominal pain, bloating, excessive gas, diarrhea, constipation, or both.
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Related Experiment Video

Updated: Jun 4, 2026

Measuring Lactase Enzymatic Activity in the Teaching Lab
04:41

Measuring Lactase Enzymatic Activity in the Teaching Lab

Published on: August 6, 2018

Lactose intolerance and the irritable colon.

J A McSherry

    Canadian Family Physician Medecin De Famille Canadien
    |February 3, 2011
    PubMed
    Summary
    This summary is machine-generated.

    Lactase deficiency causes digestive issues like bloating and diarrhea after eating lactose. Diagnosis involves breath tests or biopsies, with effective management through a lactose-free diet for many.

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    Area of Science:

    • Gastroenterology
    • Human Physiology
    • Nutritional Science

    Background:

    • Lactase deficiency presents with gastrointestinal symptoms such as nausea, abdominal pain, distension, bloating, and diarrhea following lactose ingestion.
    • Symptomatic overlap exists between lactose intolerance and bowel motility disorders, including irritable bowel syndrome (IBS) and unexplained abdominal pain.
    • Certain ethnicities, including Black, Asian, and South American populations, exhibit a higher prevalence of lactose intolerance.

    Purpose of the Study:

    • To outline the clinical presentation of lactase deficiency.
    • To discuss diagnostic methodologies for lactose intolerance.
    • To highlight the management and prognosis of lactose intolerance.

    Main Methods:

    • Diagnostic confirmation involves hydrogen breath testing post-lactose load.
    • Enzyme activity assay via small bowel biopsy provides definitive diagnosis.
    • Clinical assessment and response to dietary intervention are key.

    Main Results:

    • Lactose intolerance is characterized by a range of digestive symptoms post-lactose consumption.
    • Accurate diagnosis can be achieved through non-invasive and invasive testing methods.
    • Ethnic and demographic factors influence the likelihood of lactose intolerance.

    Conclusions:

    • Lactose intolerance is a common condition with identifiable symptoms and diagnostic pathways.
    • Effective management is achievable, particularly with a lactose-free diet when no other bowel disorders are present.
    • Understanding prevalence in different populations aids in clinical suspicion and diagnosis.