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Related Concept Videos

Inflammatory Bowel Disease II: Crohn's Disease01:30

Inflammatory Bowel Disease II: Crohn's Disease

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Introduction
Inflammatory bowel disease, commonly known as IBD, refers to a collection of disorders that lead to persistent inflammation of the gastrointestinal tract. The two types of IBD are ulcerative colitis, which impacts the colon, and Crohn's disease, which can involve any part of the gastrointestinal segment.
Crohn's disease
Crohn's disease is a chronic, systemic inflammatory bowel disease (IBD) that predominantly affects the gastrointestinal tract. It is marked by...
451
Inflammatory Bowel Disease III: Diagnostic Studies and Management I-Nutritional Therapy01:30

Inflammatory Bowel Disease III: Diagnostic Studies and Management I-Nutritional Therapy

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Various diagnostic tests are employed in the diagnostic process for Inflammatory Bowel Disease (IBD), particularly to differentiate between Crohn's disease and ulcerative colitis.
Diagnostic studies
A colonoscopy is the definitive screening test, distinguishing ulcerative colitis from other colon diseases with similar symptoms. During a colonoscopy test, inflamed mucosa with exudate ulcerations can be observed, and biopsies are taken to determine the histologic characteristics of the...
451
Irritable Bowel Syndrome I: Introduction01:17

Irritable Bowel Syndrome I: Introduction

544
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.
IBS is a chronic condition that can persist over a long period or recur frequently.
The pathogenesis of IBS involves a complex interplay of the following factors:
Altered...
544
Inflammatory Bowel Disease I: Ulcerative Colitis01:27

Inflammatory Bowel Disease I: Ulcerative Colitis

413
Introduction
Inflammatory bowel disease, or IBD, encompasses a group of disorders characterized by chronic inflammation or ulceration of the gastrointestinal tract.
Risk Factors
The exact cause of IBD remains unclear, although it is believed to be due to a mix of genetic, environmental, microbial, and immune factors. Genetic factors are significant in determining susceptibility to IBD, with family history being a critical risk factor. Individuals with a first-degree relative who has IBD are at...
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Chronic Bowel Disorders: Introduction01:17

Chronic Bowel Disorders: Introduction

566
Chronic bowel diseases are a group of long-term conditions affecting the digestive tract, characterized by inflammation and damage to the gut lining. These conditions primarily include irritable bowel syndrome and inflammatory bowel disease.
Irritable Bowel Syndrome (IBS) is a common disorder affecting the gastrointestinal tract. The distinctive feature is recurrent abdominal pain associated with altered bowel movements, manifesting as constipation, diarrhea, or fluctuating between both. The...
566
Inflammatory Bowel Disease IV: Pharmacological Management01:29

Inflammatory Bowel Disease IV: Pharmacological Management

236
Upon diagnosis, managing Inflammatory Bowel Disease (IBD) involves addressing several crucial aspects. The primary goals include resting the bowel, correcting malnutrition, and providing symptomatic relief. Resting the bowel may consist of medications to reduce inflammation and promote healing. Correcting malnutrition is essential, often requiring dietary adjustments and nutritional supplements. Symptomatic relief aims to ease pain, diarrhea, and other discomforts in IBD.
Pharmacologic...
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Related Experiment Video

Updated: Oct 14, 2025

DNBS/TNBS Colitis Models: Providing Insights Into Inflammatory Bowel Disease and Effects of Dietary Fat
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Depression and Inflammatory Bowel Disease: A Bidirectional Two-sample Mendelian Randomization Study.

Jiao Luo1,2, Zhongwei Xu3, Raymond Noordam2

  • 1Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands.

Journal of Crohn'S & Colitis
|November 5, 2021
PubMed
Summary
This summary is machine-generated.

Depression causally increases the risk of inflammatory bowel disease (IBD), including Crohn's disease and ulcerative colitis. However, inflammatory bowel disease does not appear to causally affect depression risk.

Keywords:
DepressionMendelian randomizationinflammatory bowel disease

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Area of Science:

  • Genetics
  • Gastroenterology
  • Psychiatry

Background:

  • Observational studies suggest a link between depression and inflammatory bowel disease (IBD).
  • Causality between depression and IBD remains uncertain due to challenges in establishing temporal order.
  • Bidirectional two-sample Mendelian randomization (MR) is employed to investigate causal relationships.

Purpose of the Study:

  • To determine if depression causally influences the risk of developing IBD.
  • To assess if IBD causally influences the risk of developing depression.

Main Methods:

  • Utilized independent genetic variants for depression and IBD from large genome-wide association studies (GWAS).
  • Employed various MR methods (inverse-variance-weighted, weighted-median, MR-Egger) and sensitivity analyses (Steiger filtering, MR-PRESSO).
  • Analyzed data from multiple large-scale depression and IBD databases, including meta-analysis.

Main Results:

  • Genetically predicted depression showed a significant association with increased risk of IBD (OR=1.20), Crohn's disease (OR=1.29), and ulcerative colitis (OR=1.22).
  • No significant association was found between genetically predicted IBD and depression risk.
  • Sensitivity analyses confirmed the robustness of the findings.

Conclusions:

  • Findings support a causal effect of depression on the development of IBD.
  • The study did not find evidence for a causal effect of IBD on depression.
  • Results suggest that managing depression may be important for IBD patients.